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diff --git a/third_party/jpeg-xl/lib/include/jxl/memory_manager.h b/third_party/jpeg-xl/lib/include/jxl/memory_manager.h
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+++ b/third_party/jpeg-xl/lib/include/jxl/memory_manager.h
@@ -0,0 +1,72 @@
+/* Copyright (c) the JPEG XL Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/** @addtogroup libjxl_common
+ * @{
+ * @file memory_manager.h
+ * @brief Abstraction functions used by JPEG XL to allocate memory.
+ */
+
+#ifndef JXL_MEMORY_MANAGER_H_
+#define JXL_MEMORY_MANAGER_H_
+
+#include <stddef.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+/**
+ * Allocating function for a memory region of a given size.
+ *
+ * Allocates a contiguous memory region of size @p size bytes. The returned
+ * memory may not be aligned to a specific size or initialized at all.
+ *
+ * @param opaque custom memory manager handle provided by the caller.
+ * @param size in bytes of the requested memory region.
+ * @return @c NULL if the memory can not be allocated,
+ * @return pointer to the memory otherwise.
+ */
+typedef void* (*jpegxl_alloc_func)(void* opaque, size_t size);
+
+/**
+ * Deallocating function pointer type.
+ *
+ * This function @b MUST do nothing if @p address is @c NULL.
+ *
+ * @param opaque custom memory manager handle provided by the caller.
+ * @param address memory region pointer returned by ::jpegxl_alloc_func, or @c
+ * NULL.
+ */
+typedef void (*jpegxl_free_func)(void* opaque, void* address);
+
+/**
+ * Memory Manager struct.
+ * These functions, when provided by the caller, will be used to handle memory
+ * allocations.
+ */
+typedef struct JxlMemoryManagerStruct {
+  /** The opaque pointer that will be passed as the first parameter to all the
+   * functions in this struct. */
+  void* opaque;
+
+  /** Memory allocation function. This can be NULL if and only if also the
+   * free() member in this class is NULL. All dynamic memory will be allocated
+   * and freed with these functions if they are not NULL. */
+  jpegxl_alloc_func alloc;
+  /** Free function matching the alloc() member. */
+  jpegxl_free_func free;
+
+  /* TODO(deymo): Add cache-aligned alloc/free functions here. */
+} JxlMemoryManager;
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* JXL_MEMORY_MANAGER_H_ */
+
+/** @}*/