diff --git a/compiler-rt/lib/fuzzer/FuzzerExtraCounters.cpp b/compiler-rt/lib/fuzzer/FuzzerExtraCounters.cpp
--- a/compiler-rt/lib/fuzzer/FuzzerExtraCounters.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerExtraCounters.cpp
@@ -11,6 +11,10 @@
 #include "FuzzerPlatform.h"
 #include <cstdint>

+#if LIBFUZZER_WINDOWS
+#include <Windows.h>
+#endif
+
 #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD ||                \
     LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN
 __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters;
@@ -31,6 +35,71 @@

 }  // namespace fuzzer

+#elif LIBFUZZER_WINDOWS
+
+namespace fuzzer {
+
+//
+// The __start___libfuzzer_extra_counters variable is align 16, size 16 to
+// ensure the padding between it and the next variable in this section (either
+// __libfuzzer_extra_counters or __stop___libfuzzer_extra_counters) will be
+// located at (__start___libfuzzer_extra_counters +
+// sizeof(__start___libfuzzer_extra_counters)). Otherwise, the calculation of
+// (stop - (start + sizeof(start))) might be skewed.
+//
+// The section name, __libfuzzer_extra_countaaa ends with "aaa", so it sorts
+// before __libfuzzer_extra_counters alphabetically. We want the start symbol to
+// be placed in the section just before the user supplied counters (if present).
+//
+#pragma section(".data$__libfuzzer_extra_countaaa")
+ATTRIBUTE_ALIGNED(16)
+__declspec(allocate(".data$__libfuzzer_extra_countaaa")) uint8_t
+    __start___libfuzzer_extra_counters[16] = {0};
+
+//
+// Example of what the user-supplied counters should look like. First, the
+// pragma to create the section name. It will fall alphabetically between
+// ".data$__libfuzzer_extra_countaaa" and ".data$__libfuzzer_extra_countzzz".
+// Next, the declspec to allocate the variable inside the specified section.
+// Finally, some array, struct, whatever that is used to track the counter data.
+// The size of this variable is computed at runtime by finding the difference of
+// __stop___libfuzzer_extra_counters and __start___libfuzzer_extra_counters +
+// sizeof(__start___libfuzzer_extra_counters).
+//
+
+//
+//     #pragma section(".data$__libfuzzer_extra_counters")
+//     __declspec(allocate(".data$__libfuzzer_extra_counters"))
+//         uint8_t any_name_variable[64 * 1024];
+//
+
+//
+// Here, the section name, __libfuzzer_extra_countzzz ends with "zzz", so it
+// sorts after __libfuzzer_extra_counters alphabetically. We want the stop
+// symbol to be placed in the section just after the user supplied counters (if
+// present). Align to 1 so there isn't any padding placed between this and the
+// previous variable.
+//
+#pragma section(".data$__libfuzzer_extra_countzzz")
+ATTRIBUTE_ALIGNED(1)
+__declspec(allocate(".data$__libfuzzer_extra_countzzz")) uint8_t
+    __stop___libfuzzer_extra_counters = 0;
+
+uint8_t *ExtraCountersBegin() {
+  return __start___libfuzzer_extra_counters +
+         sizeof(__start___libfuzzer_extra_counters);
+}
+
+uint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; }
+
+ATTRIBUTE_NO_SANITIZE_ALL
+void ClearExtraCounters() {
+  uint8_t *Beg = ExtraCountersBegin();
+  SecureZeroMemory(Beg, ExtraCountersEnd() - Beg);
+}
+
+} // namespace fuzzer
+
 #else
 // TODO: implement for other platforms.
 namespace fuzzer {
diff --git a/compiler-rt/test/fuzzer/TableLookupTest.cpp b/compiler-rt/test/fuzzer/TableLookupTest.cpp
--- a/compiler-rt/test/fuzzer/TableLookupTest.cpp
+++ b/compiler-rt/test/fuzzer/TableLookupTest.cpp
@@ -25,6 +25,10 @@
 #ifdef __linux__
 __attribute__((section("__libfuzzer_extra_counters")))
 #endif
+#ifdef _WIN32
+#pragma section(".data$__libfuzzer_extra_counters")
+__declspec(allocate(".data$__libfuzzer_extra_counters"))
+#endif
 static uint8_t Counters[N];

 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
diff --git a/compiler-rt/test/fuzzer/extra-counters.test b/compiler-rt/test/fuzzer/extra-counters.test
--- a/compiler-rt/test/fuzzer/extra-counters.test
+++ b/compiler-rt/test/fuzzer/extra-counters.test
@@ -1,5 +1,3 @@
-REQUIRES: linux
-
 RUN: %cpp_compiler %S/TableLookupTest.cpp -o %t-TableLookupTest
 RUN: not %run %t-TableLookupTest -print_final_stats=1 2>&1 | FileCheck %s
 CHECK: INFO: {{[0-9]+}} Extra Counters