diff --git a/include/kernel.h b/include/kernel.h
index 3b269609d04..95a07d2ce01 100644
--- a/include/kernel.h
+++ b/include/kernel.h
@@ -4546,7 +4546,7 @@ void k_heap_free(struct k_heap *h, void *mem);
  * If the pool is to be accessed outside the module where it is defined, it
  * can be declared via
  *
- * @note When @option{CONFIG_MEM_POOL_HEAP_BACKEND} is enabled, the k_mem_pool
+ * @note The k_mem_pool
  * API is implemented on top of a k_heap, which is a more general
  * purpose allocator which does not make the same promises about
  * splitting or alignment detailed above.  Blocks will be aligned only
diff --git a/include/kernel_includes.h b/include/kernel_includes.h
index 20da24c4848..780d7a4fa28 100644
--- a/include/kernel_includes.h
+++ b/include/kernel_includes.h
@@ -27,11 +27,7 @@
 #include <sys/util.h>
 #include <sys/mempool_base.h>
 #include <kernel_structs.h>
-#ifdef CONFIG_MEM_POOL_HEAP_BACKEND
 #include <mempool_heap.h>
-#else
-#include <mempool_sys.h>
-#endif
 #include <kernel_version.h>
 #include <syscall.h>
 #include <sys/printk.h>
diff --git a/include/mempool_sys.h b/include/mempool_sys.h
deleted file mode 100644
index 1ff1dc85f9c..00000000000
--- a/include/mempool_sys.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * Copyright (c) 2020 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#ifndef ZEPHYR_INCLUDE_MEMPOOL_SYS_H_
-
-/**
- * @defgroup mem_pool_apis Memory Pool APIs
- * @ingroup kernel_apis
- * @{
- */
-
-/* Note on sizing: the use of a 20 bit field for block means that,
- * assuming a reasonable minimum block size of 16 bytes, we're limited
- * to 16M of memory managed by a single pool.  Long term it would be
- * good to move to a variable bit size based on configuration.
- */
-struct k_mem_block_id {
-	uint32_t pool : 8;
-	uint32_t level : 4;
-	uint32_t block : 20;
-};
-
-struct k_mem_block {
-	void *data;
-	struct k_mem_block_id id;
-};
-
-/** @} */
-
-struct k_mem_pool {
-	struct sys_mem_pool_base base;
-	_wait_q_t wait_q;
-};
-
-#define Z_MEM_POOL_DEFINE(name, minsz, maxsz, nmax, align)		\
-	char __aligned(WB_UP(align)) _mpool_buf_##name[WB_UP(maxsz) * nmax \
-				  + _MPOOL_BITS_SIZE(maxsz, minsz, nmax)]; \
-	struct sys_mem_pool_lvl						\
-		_mpool_lvls_##name[Z_MPOOL_LVLS(maxsz, minsz)]; \
-	Z_STRUCT_SECTION_ITERABLE(k_mem_pool, name) = { \
-		.base = {						\
-			.buf = _mpool_buf_##name,			\
-			.max_sz = WB_UP(maxsz),				\
-			.n_max = nmax,					\
-			.n_levels = Z_MPOOL_LVLS(maxsz, minsz),		\
-			.levels = _mpool_lvls_##name,			\
-			.flags = SYS_MEM_POOL_KERNEL			\
-		} \
-	}; \
-	BUILD_ASSERT(WB_UP(maxsz) >= _MPOOL_MINBLK)
-
-#endif /* ZEPHYR_INCLUDE_MEMPOOL_SYS_H_ */
diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index b2074e98474..cde6447d64d 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -52,11 +52,6 @@ target_sources_ifdef(CONFIG_POLL                  kernel PRIVATE poll.c)
 
 if(${CONFIG_KERNEL_MEM_POOL})
   target_sources(kernel PRIVATE mempool.c)
-
-  if(${CONFIG_MEM_POOL_HEAP_BACKEND})
-  else()
-    target_sources(kernel PRIVATE mempool_sys.c)
-  endif()
 endif()
 
 if(NOT CONFIG_MULTITHREADING)
diff --git a/kernel/Kconfig b/kernel/Kconfig
index b958db2a599..bf5bcdd1010 100644
--- a/kernel/Kconfig
+++ b/kernel/Kconfig
@@ -502,16 +502,6 @@ config KERNEL_MEM_POOL
 
 if KERNEL_MEM_POOL
 
-config MEM_POOL_HEAP_BACKEND
-	bool "Use k_heap as the backend for k_mem_pool"
-	default y
-	help
-	  This selects a backend implementation for k_mem_pool based
-	  on the sys_heap abstraction instead of the legacy
-	  sys_mem_pool.  This backend has significantly better
-	  performance and memory utilization for general purpose
-	  workloads.
-
 config HEAP_MEM_POOL_SIZE
 	int "Heap memory pool size (in bytes)"
 	default 0 if !POSIX_MQUEUE
diff --git a/kernel/kheap.c b/kernel/kheap.c
index b436e097be5..08e0702a5ae 100644
--- a/kernel/kheap.c
+++ b/kernel/kheap.c
@@ -64,7 +64,6 @@ void k_heap_free(struct k_heap *h, void *mem)
 	}
 }
 
-#ifdef CONFIG_MEM_POOL_HEAP_BACKEND
 /* Compatibility layer for legacy k_mem_pool code on top of a k_heap
  * backend.
  */
@@ -89,5 +88,3 @@ void k_mem_pool_free_id(struct k_mem_block_id *id)
 {
 	k_heap_free(id->heap, id->data);
 }
-
-#endif /* CONFIG_MEM_POOL_HEAP_BACKEND */
diff --git a/kernel/mempool_sys.c b/kernel/mempool_sys.c
deleted file mode 100644
index 9139dc9dfeb..00000000000
--- a/kernel/mempool_sys.c
+++ /dev/null
@@ -1,110 +0,0 @@
-/*
- * Copyright (c) 2017, 2020 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <kernel.h>
-#include <ksched.h>
-#include <wait_q.h>
-#include <init.h>
-
-static struct k_spinlock lock;
-
-static struct k_mem_pool *get_pool(int id)
-{
-	extern struct k_mem_pool _k_mem_pool_list_start[];
-
-	return &_k_mem_pool_list_start[id];
-}
-
-static int pool_id(struct k_mem_pool *pool)
-{
-	extern struct k_mem_pool _k_mem_pool_list_start[];
-
-	return pool - &_k_mem_pool_list_start[0];
-}
-
-static void k_mem_pool_init(struct k_mem_pool *p)
-{
-	z_waitq_init(&p->wait_q);
-	z_sys_mem_pool_base_init(&p->base);
-}
-
-int init_static_pools(const struct device *unused)
-{
-	ARG_UNUSED(unused);
-
-	Z_STRUCT_SECTION_FOREACH(k_mem_pool, p) {
-		k_mem_pool_init(p);
-	}
-
-	return 0;
-}
-
-SYS_INIT(init_static_pools, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
-
-int k_mem_pool_alloc(struct k_mem_pool *p, struct k_mem_block *block,
-		     size_t size, k_timeout_t timeout)
-{
-	int ret;
-	uint64_t end = 0;
-
-	__ASSERT(!(arch_is_in_isr() && !K_TIMEOUT_EQ(timeout, K_NO_WAIT)), "");
-
-	end = z_timeout_end_calc(timeout);
-
-	while (true) {
-		uint32_t level_num, block_num;
-
-		ret = z_sys_mem_pool_block_alloc(&p->base, size,
-						 &level_num, &block_num,
-						 &block->data);
-		block->id.pool = pool_id(p);
-		block->id.level = level_num;
-		block->id.block = block_num;
-
-		if (ret == 0 || K_TIMEOUT_EQ(timeout, K_NO_WAIT) ||
-		    ret != -ENOMEM) {
-			return ret;
-		}
-
-		z_pend_curr_unlocked(&p->wait_q, timeout);
-
-		if (!K_TIMEOUT_EQ(timeout, K_FOREVER)) {
-			int64_t remaining = end - z_tick_get();
-
-			if (remaining <= 0) {
-				break;
-			}
-			timeout = Z_TIMEOUT_TICKS(remaining);
-		}
-	}
-
-	return -EAGAIN;
-}
-
-void k_mem_pool_free_id(struct k_mem_block_id *id)
-{
-	int need_sched = 0;
-	struct k_mem_pool *p = get_pool(id->pool);
-
-	z_sys_mem_pool_block_free(&p->base, id->level, id->block);
-
-	/* Wake up anyone blocked on this pool and let them repeat
-	 * their allocation attempts
-	 *
-	 * (Note that this spinlock only exists because z_unpend_all()
-	 * is unsynchronized.  Maybe we want to put the lock into the
-	 * wait_q instead and make the API safe?)
-	 */
-	k_spinlock_key_t key = k_spin_lock(&lock);
-
-	need_sched = z_unpend_all(&p->wait_q);
-
-	if (need_sched != 0) {
-		z_reschedule(&lock, key);
-	} else {
-		k_spin_unlock(&lock, key);
-	}
-}
diff --git a/tests/kernel/mem_heap/mheap_api_concept/src/main.c b/tests/kernel/mem_heap/mheap_api_concept/src/main.c
index 9fdf924f7cc..94608397a2a 100644
--- a/tests/kernel/mem_heap/mheap_api_concept/src/main.c
+++ b/tests/kernel/mem_heap/mheap_api_concept/src/main.c
@@ -28,7 +28,6 @@ void test_main(void)
 			 ztest_unit_test(test_mheap_malloc_free),
 			 ztest_unit_test(test_mheap_calloc),
 			 ztest_unit_test(test_mheap_malloc_align4),
-			 ztest_unit_test(test_mheap_min_block_size),
 			 ztest_unit_test(test_mheap_block_desc),
 			 ztest_unit_test(test_mheap_block_release));
 	ztest_run_test_suite(mheap_api);
diff --git a/tests/kernel/mem_heap/mheap_api_concept/src/test_mheap_concept.c b/tests/kernel/mem_heap/mheap_api_concept/src/test_mheap_concept.c
index 1cd0ae351d7..83f7a306f11 100644
--- a/tests/kernel/mem_heap/mheap_api_concept/src/test_mheap_concept.c
+++ b/tests/kernel/mem_heap/mheap_api_concept/src/test_mheap_concept.c
@@ -45,57 +45,6 @@ void test_mheap_malloc_align4(void)
 	}
 }
 
-/**
- * @brief The test case to ensure heap minimum block size is 64 bytes.
- *
- * @ingroup kernel_heap_tests
- *
- * @see k_malloc(), k_free()
- *
- * @details Heap pool's minimum block size is 64 bytes. The test case tries
- * to ensure it by allocating blocks lesser than minimum block size.
- * The test allocates 8 blocks of size 0. The algorithm has to allocate 64
- * bytes of blocks, this is ensured by allocating one more block of max size
- * which results in failure. Finally all the blocks are freed and added back
- * to heap memory pool.
- */
-void test_mheap_min_block_size(void)
-{
-	void *block[BLK_NUM_MAX], *block_fail;
-
-	/* The k_heap backend doesn't have the splitting behavior
-	 * expected here, this test is too specific, and a more
-	 * general version of the same test is available in
-	 * test_mheap_malloc_free()
-	 */
-	if (IS_ENABLED(CONFIG_MEM_POOL_HEAP_BACKEND)) {
-		ztest_test_skip();
-	}
-
-	/**
-	 * TESTPOINT: The heap memory pool also defines a minimum block
-	 * size of 64 bytes.
-	 * Test steps:
-	 * initial memory heap status (F for free, U for used):
-	 *    64F, 64F, 64F, 64F
-	 * 1. request 4 blocks: each 0-byte plus 16-byte block desc,
-	 *    indeed 64-byte allocated
-	 * 2. verify no more free blocks, any further allocation failed
-	 */
-	for (int i = 0; i < BLK_NUM_MAX; i++) {
-		block[i] = k_malloc(TEST_SIZE_0);
-		zassert_not_null(block[i], NULL);
-	}
-	/* verify no more free blocks available*/
-	block_fail = k_malloc(BLK_SIZE_MIN);
-	zassert_is_null(block_fail, NULL);
-
-	/* test case tear down*/
-	for (int i = 0; i < BLK_NUM_MAX; i++) {
-		k_free(block[i]);
-	}
-}
-
 /**
  * @brief Verify if the block descriptor is included
  * in every block which is allocated
diff --git a/tests/kernel/mem_pool/mem_pool/src/main.c b/tests/kernel/mem_pool/mem_pool/src/main.c
index 07cb35ac488..c8dd55e9845 100644
--- a/tests/kernel/mem_pool/mem_pool/src/main.c
+++ b/tests/kernel/mem_pool/mem_pool/src/main.c
@@ -34,12 +34,10 @@
  * depends on words size.  So we keep separate tables for different
  * configs.
  */
-#ifdef CONFIG_MEM_POOL_HEAP_BACKEND
-# ifdef CONFIG_64BIT
-#  define HEAP64
-# else
-#  define HEAP32
-# endif
+#ifdef CONFIG_64BIT
+# define HEAP64
+#else
+# define HEAP32
 #endif
 
 /* size of stack area used by each thread */
@@ -317,12 +315,6 @@ void alternate_task(void)
  * amount of usable space, due to the hidden block descriptor info the
  * kernel adds at the start of any block allocated from this memory pool.)
  *
- * NOTE: when CONFIG_MEM_POOL_HEAP_BACKEND is in use, the splitting
- * algorithm being exercised by this test is not used.  In fact the
- * k_heap backend is significantly more fragmentation resistant, so
- * calls expected to fail here actually succeed.  These are disabled
- * here.
- *
  * @see k_malloc(), k_free()
  */
 static void test_pool_malloc(void)
@@ -334,12 +326,6 @@ static void test_pool_malloc(void)
 	block[0] = k_malloc(150);
 	zassert_not_null(block[0], "150 byte allocation failed");
 
-#ifndef CONFIG_MEM_POOL_HEAP_BACKEND
-	/* ensure a small block can no longer be allocated */
-	block[1] = k_malloc(16);
-	zassert_is_null(block[1], "16 byte allocation did not fail");
-#endif
-
 	/* return the large block */
 	k_free(block[0]);
 
@@ -347,23 +333,12 @@ static void test_pool_malloc(void)
 	block[0] = k_malloc(16);
 	zassert_not_null(block[0], "16 byte allocation 0 failed");
 
-#ifndef CONFIG_MEM_POOL_HEAP_BACKEND
-	/* ensure a large block can no longer be allocated */
-	block[1] = k_malloc(80);
-	zassert_is_null(block[1], "80 byte allocation did not fail");
-#endif
-
 	/* ensure all remaining small blocks can be allocated */
 	for (j = 1; j < 4; j++) {
 		block[j] = k_malloc(16);
 		zassert_not_null(block[j], "16 byte allocation %d failed\n", j);
 	}
 
-#ifndef CONFIG_MEM_POOL_HEAP_BACKEND
-	/* ensure a small block can no longer be allocated */
-	zassert_is_null(k_malloc(8), "8 byte allocation did not fail");
-#endif
-
 	/* return the small blocks to pool in a "random" order */
 	k_free(block[2]);
 	k_free(block[0]);
@@ -374,12 +349,6 @@ static void test_pool_malloc(void)
 	block[0] = k_malloc(100);
 	zassert_not_null(block[0], "100 byte allocation failed");
 
-
-#ifndef CONFIG_MEM_POOL_HEAP_BACKEND
-	/* ensure a small block can no longer be allocated */
-	zassert_is_null(k_malloc(32), "32 byte allocation did not fail");
-#endif
-
 	/* ensure overflow detection is working */
 	zassert_is_null(k_malloc(0xffffffff), "overflow check failed");
 	zassert_is_null(k_calloc(0xffffffff, 2), "overflow check failed");
diff --git a/tests/kernel/mem_pool/mem_pool/testcase.yaml b/tests/kernel/mem_pool/mem_pool/testcase.yaml
index 78d815a13fd..dfa0450076f 100644
--- a/tests/kernel/mem_pool/mem_pool/testcase.yaml
+++ b/tests/kernel/mem_pool/mem_pool/testcase.yaml
@@ -1,8 +1,3 @@
 tests:
   kernel.memory_pool:
     tags: kernel mem_pool
-  kernel.memory_pool.legacy:
-    min_ram: 32
-    tags: kernel mem_pool
-    extra_configs:
-      - CONFIG_MEM_POOL_HEAP_BACKEND=n
diff --git a/tests/kernel/mem_pool/mem_pool_api/src/main.c b/tests/kernel/mem_pool/mem_pool_api/src/main.c
index 5dfe24336dc..c82c03631f1 100644
--- a/tests/kernel/mem_pool/mem_pool_api/src/main.c
+++ b/tests/kernel/mem_pool/mem_pool_api/src/main.c
@@ -17,7 +17,6 @@
 extern void test_mpool_alloc_free_thread(void);
 extern void test_mpool_alloc_free_isr(void);
 extern void test_mpool_kdefine_extern(void);
-extern void test_mpool_alloc_size(void);
 extern void test_mpool_alloc_timeout(void);
 extern void test_sys_heap_mem_pool_assign(void);
 
@@ -28,7 +27,6 @@ void test_main(void)
 			 ztest_unit_test(test_mpool_alloc_free_thread),
 			 ztest_unit_test(test_mpool_alloc_free_isr),
 			 ztest_unit_test(test_mpool_kdefine_extern),
-			 ztest_unit_test(test_mpool_alloc_size),
 			 ztest_unit_test(test_mpool_alloc_timeout),
 			 ztest_unit_test(test_sys_heap_mem_pool_assign)
 			 );
diff --git a/tests/kernel/mem_pool/mem_pool_api/src/test_mpool_api.c b/tests/kernel/mem_pool/mem_pool_api/src/test_mpool_api.c
index 411217e3247..8b8d9decc05 100644
--- a/tests/kernel/mem_pool/mem_pool_api/src/test_mpool_api.c
+++ b/tests/kernel/mem_pool/mem_pool_api/src/test_mpool_api.c
@@ -87,64 +87,6 @@ void test_mpool_alloc_free_isr(void)
 	irq_offload(tmpool_alloc_free, NULL);
 }
 
-/**
- * @ingroup kernel_memory_pool_tests
- * @brief Validates breaking a block into quarters feature
- *
- * @details The test case validates how a mem_pool provides
- * functionality to break a block into quarters and repeatedly
- * allocate and free the blocks.
- * @see k_mem_pool_alloc(), k_mem_pool_free()
- */
-void test_mpool_alloc_size(void)
-{
-	static struct k_mem_block block[BLK_NUM_MIN];
-	size_t size = BLK_SIZE_MAX;
-	int i = 0;
-
-	/* The sys_heap backend doesn't use the specific block
-	 * breaking algorithm tested here.  This is a test of the
-	 * legacy sys_mem_pool allocator only.
-	 */
-	if (IS_ENABLED(CONFIG_MEM_POOL_HEAP_BACKEND)) {
-		ztest_test_skip();
-	}
-
-	/**TESTPOINT: The memory pool allows blocks to be repeatedly partitioned
-	 * into quarters, down to blocks of @a min_size bytes long.
-	 */
-	while (size >= BLK_SIZE_MIN) {
-		zassert_true(k_mem_pool_alloc(&kmpool, &block[i], size,
-					      K_NO_WAIT) == 0, NULL);
-		zassert_not_null(block[i].data, NULL);
-		zassert_true((uintptr_t)(block[i].data) % BLK_ALIGN == 0, NULL);
-		i++;
-		size = size >> 2;
-	}
-	while (i--) {
-		k_mem_pool_free(&block[i]);
-		block[i].data = NULL;
-	}
-
-	i = 0;
-	size = BLK_SIZE_MIN;
-	/**TESTPOINT: To ensure that all blocks in the buffer are similarly
-	 * aligned to this boundary, min_size must also be a multiple of align.
-	 */
-	while (size <= BLK_SIZE_MAX) {
-		zassert_true(k_mem_pool_alloc(&kmpool, &block[i], size,
-					      K_NO_WAIT) == 0, NULL);
-		zassert_not_null(block[i].data, NULL);
-		zassert_true((uintptr_t)(block[i].data) % BLK_ALIGN == 0, NULL);
-		i++;
-		size = size << 2;
-	}
-	while (i--) {
-		k_mem_pool_free(&block[i]);
-		block[i].data = NULL;
-	}
-}
-
 /**
  * @see k_mem_pool_alloc(), k_mem_pool_free()
  * @brief Verify memory pool allocation with timeouts
@@ -164,16 +106,7 @@ void test_mpool_alloc_timeout(void)
 		}
 	}
 
-	/* The original mem_pool would always be able to allocate
-	 * exactly "min blocks" before running out of space, the
-	 * heuristics used to size the sys_heap backend are more
-	 * flexible.
-	 */
-#ifdef CONFIG_MEM_POOL_HEAP_BACKEND
 	zassert_true(nb >= BLK_NUM_MIN, NULL);
-#else
-	zassert_true(nb == BLK_NUM_MIN, NULL);
-#endif
 
 	/** TESTPOINT: Use K_NO_WAIT to return without waiting*/
 	/** TESTPOINT: @retval -ENOMEM Returned without waiting*/
diff --git a/tests/kernel/mem_pool/mem_pool_api/testcase.yaml b/tests/kernel/mem_pool/mem_pool_api/testcase.yaml
index 2ff98117676..3371a2c2fd2 100644
--- a/tests/kernel/mem_pool/mem_pool_api/testcase.yaml
+++ b/tests/kernel/mem_pool/mem_pool_api/testcase.yaml
@@ -1,7 +1,3 @@
 tests:
   kernel.memory_pool.api:
     tags: kernel mem_pool
-  kernel.memory_pool.api.legacy:
-    tags: kernel mem_pool
-    extra_configs:
-      - CONFIG_MEM_POOL_HEAP_BACKEND=n
diff --git a/tests/kernel/mem_pool/mem_pool_concept/src/main.c b/tests/kernel/mem_pool/mem_pool_concept/src/main.c
index 1b4efc018ac..3dd8f1d64b0 100644
--- a/tests/kernel/mem_pool/mem_pool_concept/src/main.c
+++ b/tests/kernel/mem_pool/mem_pool_concept/src/main.c
@@ -6,17 +6,11 @@
 
 #include <ztest.h>
 extern void test_mpool_alloc_wait_prio(void);
-extern void test_mpool_alloc_size_roundup(void);
-extern void test_mpool_alloc_merge_failed_diff_size(void);
-extern void test_mpool_alloc_merge_failed_diff_parent(void);
 
 /*test case main entry*/
 void test_main(void)
 {
 	ztest_test_suite(mpool_concept,
-		ztest_1cpu_unit_test(test_mpool_alloc_wait_prio),
-		ztest_unit_test(test_mpool_alloc_size_roundup),
-		ztest_unit_test(test_mpool_alloc_merge_failed_diff_size),
-		ztest_unit_test(test_mpool_alloc_merge_failed_diff_parent));
+			 ztest_1cpu_unit_test(test_mpool_alloc_wait_prio));
 	ztest_run_test_suite(mpool_concept);
 }
diff --git a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_size.c b/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_size.c
deleted file mode 100644
index 441b0ad9e00..00000000000
--- a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_size.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Copyright (c) 2016 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <ztest.h>
-#include "test_mpool.h"
-
-#define TEST_SIZE ((BLK_SIZE_MAX >> 2) + 1)
-
-extern struct k_mem_pool mpool1;
-
-/*test cases*/
-/**
- * @brief Test alloc and free of different blocks sizes
- *
- * @ingroup kernel_memory_pool_tests
- *
- * @details The test demonstrates how the request is handled
- * to allocate the minimum available size block in memory pool
- * to satisfy the requirement of the application.
- */
-void test_mpool_alloc_size_roundup(void)
-{
-	struct k_mem_block block[BLK_NUM_MAX], block_fail;
-
-	/* This test is written to assume specific heap layout, in
-	 * fact the sys_heap backend can routinely see more than "min
-	 * blocks" allocated.
-	 */
-	if (IS_ENABLED(CONFIG_MEM_POOL_HEAP_BACKEND)) {
-		ztest_test_skip();
-	}
-
-	/**
-	 * TESTPOINT: When an application issues a request for a memory block,
-	 * the memory pool first determines the size of the smallest block that
-	 * will satisfy the request
-	 */
-	for (int i = 0; i < BLK_NUM_MAX; i++) {
-		/*request a size for the mpool to round up to "BLK_SIZE_MAX"*/
-		zassert_true(k_mem_pool_alloc(&mpool1, &block[i], TEST_SIZE,
-					      K_NO_WAIT) == 0, NULL);
-	}
-	/*verify consequently no more blocks available*/
-	zassert_true(k_mem_pool_alloc(&mpool1, &block_fail, BLK_SIZE_MIN,
-				      K_NO_WAIT) == -ENOMEM, NULL);
-
-	/*test case tear down*/
-	for (int i = 0; i < BLK_NUM_MAX; i++) {
-		k_mem_pool_free(&block[i]);
-	}
-}
diff --git a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_wait.c b/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_wait.c
index db7c5e9a0a4..4e5c8325614 100644
--- a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_wait.c
+++ b/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_alloc_wait.c
@@ -63,17 +63,7 @@ void test_mpool_alloc_wait_prio(void)
 		}
 	}
 
-	/* The original mem_pool would always be able to allocate
-	 * exactly "min blocks" before running out of space, the
-	 * heuristics used to size the sys_heap backend are more
-	 * flexible.
-	 */
-#ifdef CONFIG_MEM_POOL_HEAP_BACKEND
 	zassert_true(nb >= BLK_NUM_MIN, "nb %d want %d", nb, BLK_NUM_MIN);
-#else
-	zassert_true(nb == BLK_NUM_MIN, NULL);
-#endif
-
 
 	/**
 	 * TESTPOINT: when a suitable memory block becomes available, it is
diff --git a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_parent.c b/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_parent.c
deleted file mode 100644
index bb4e76e8c3f..00000000000
--- a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_parent.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright (c) 2016 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <ztest.h>
-#include "test_mpool.h"
-
-extern struct k_mem_pool mpool1;
-
-/*test cases*/
-/**
- * @brief Test to verify merge of blocks of different quad-block
- *
- * @ingroup kernel_memory_pool_tests
- *
- * @details TESTPOINT: The algo cannot merge adjacent free blocks
- * of the same size if they belong to different parent quad-blocks
- * Test steps: 1. allocate block [0~7] in minimum block size
- * 2. free block [2~5], belong to diff parental quad-blocks
- * 3. request a big block
- * verify blocks [2, 3] and blocks [4, 5] can't be merged
- * 4. tear down, free blocks [0, 1, 6, 7]
- */
-void test_mpool_alloc_merge_failed_diff_parent(void)
-{
-	/* The heap backend doesn't use the splitting mechanism tested
-	 * here, and in fact is significantly more fragmentation
-	 * resistant and succeeds at the "failed" allocation desired
-	 * below.
-	 */
-	if (IS_ENABLED(CONFIG_MEM_POOL_HEAP_BACKEND)) {
-		ztest_test_skip();
-	}
-
-	struct k_mem_block block[BLK_NUM_MIN], block_fail;
-
-	for (int i = 0; i < BLK_NUM_MIN; i++) {
-		/* 1. allocated up all blocks*/
-		zassert_true(k_mem_pool_alloc(&mpool1, &block[i], BLK_SIZE_MIN,
-					      K_NO_WAIT) == 0, NULL);
-	}
-	/* 2. free adjacent blocks belong to different parent quad-blocks*/
-	for (int i = 2; i < 6; i++) {
-		k_mem_pool_free(&block[i]);
-	}
-	/* 3. request a big block, expected failed to merge*/
-	zassert_true(k_mem_pool_alloc(&mpool1, &block_fail, BLK_SIZE_MAX,
-				      TIMEOUT) == -EAGAIN, NULL);
-
-	/* 4. test case tear down*/
-	k_mem_pool_free(&block[0]);
-	k_mem_pool_free(&block[1]);
-	k_mem_pool_free(&block[6]);
-	k_mem_pool_free(&block[7]);
-}
diff --git a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_size.c b/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_size.c
deleted file mode 100644
index 3a87a3b3dec..00000000000
--- a/tests/kernel/mem_pool/mem_pool_concept/src/test_mpool_merge_fail_diff_size.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Copyright (c) 2016 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <ztest.h>
-#define TIMEOUT K_MSEC(2000)
-#define BLK_SIZE_MIN 16
-#define BLK_SIZE_MID 32
-#define BLK_SIZE_MAX 256
-#define BLK_NUM_MIN 32
-#define BLK_NUM_MAX 2
-#define BLK_ALIGN BLK_SIZE_MIN
-
-K_MEM_POOL_DEFINE(mpool3, BLK_SIZE_MIN, BLK_SIZE_MAX, BLK_NUM_MAX, BLK_ALIGN);
-
-/*test cases*/
-/**
- * @brief Verify blocks of different sizes cannot be merged.
- *
- * @ingroup kernel_memory_pool_tests
- *
- * @details The merging algorithm cannot combine adjacent free blocks
- * of different sizes
- * Test steps: 1. allocate 14 blocks in different sizes
- * 2. free block [2~8], in different sizes
- * 3. request a big block verify blocks [2~8] can't be merged
- * 4. tear down, free blocks [0, 1, 9~13]
- */
-void test_mpool_alloc_merge_failed_diff_size(void)
-{
-	/* The heap backend doesn't use the splitting mechanism tested
-	 * here, and in fact is significantly more fragmentation
-	 * resistant and succeeds at the "failed" allocation desired
-	 * below.
-	 */
-	if (IS_ENABLED(CONFIG_MEM_POOL_HEAP_BACKEND)) {
-		ztest_test_skip();
-	}
-
-	struct k_mem_block block[BLK_NUM_MIN], block_fail;
-	size_t block_size[] = {
-		BLK_SIZE_MIN, BLK_SIZE_MIN, BLK_SIZE_MIN, BLK_SIZE_MIN,
-		BLK_SIZE_MID, BLK_SIZE_MID, BLK_SIZE_MID,
-		BLK_SIZE_MIN, BLK_SIZE_MIN, BLK_SIZE_MIN, BLK_SIZE_MIN,
-		BLK_SIZE_MID, BLK_SIZE_MID, BLK_SIZE_MID
-	};
-	int block_count = ARRAY_SIZE(block_size);
-
-
-	for (int i = 0; i < block_count; i++) {
-		/* 1. allocate blocks in different sizes*/
-		zassert_true(k_mem_pool_alloc(&mpool3, &block[i], block_size[i],
-					      K_NO_WAIT) == 0, NULL);
-	}
-	/* 2. free block [2~8], in different sizes*/
-	for (int i = 2; i < 9; i++) {
-		k_mem_pool_free(&block[i]);
-	}
-	/* 3. request a big block, expected failed to merge*/
-	zassert_true(k_mem_pool_alloc(&mpool3, &block_fail, BLK_SIZE_MAX,
-				      TIMEOUT) == -EAGAIN, NULL);
-
-	/* 4. test case tear down*/
-	k_mem_pool_free(&block[0]);
-	k_mem_pool_free(&block[1]);
-	for (int i = 9; i < block_count; i++) {
-		k_mem_pool_free(&block[i]);
-	}
-}
diff --git a/tests/kernel/mem_pool/mem_pool_concept/testcase.yaml b/tests/kernel/mem_pool/mem_pool_concept/testcase.yaml
index 7af92431ff2..46ddfd96182 100644
--- a/tests/kernel/mem_pool/mem_pool_concept/testcase.yaml
+++ b/tests/kernel/mem_pool/mem_pool_concept/testcase.yaml
@@ -1,7 +1,3 @@
 tests:
   kernel.memory_pool.concept:
     tags: kernel mem_pool
-  kernel.memory_pool.concept.legacy:
-    tags: kernel mem_pool
-    extra_configs:
-      - CONFIG_MEM_POOL_HEAP_BACKEND=n
diff --git a/tests/kernel/mem_pool/mem_pool_threadsafe/testcase.yaml b/tests/kernel/mem_pool/mem_pool_threadsafe/testcase.yaml
index 1e63da93f79..2471e944a49 100644
--- a/tests/kernel/mem_pool/mem_pool_threadsafe/testcase.yaml
+++ b/tests/kernel/mem_pool/mem_pool_threadsafe/testcase.yaml
@@ -1,7 +1,3 @@
 tests:
   kernel.memory_pool.threadsafe:
     tags: kernel mem_pool
-  kernel.memory_pool.threadsafe.legacy:
-    tags: kernel mem_pool
-    extra_configs:
-      - CONFIG_MEM_POOL_HEAP_BACKEND=n