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
@@ -31,6 +31,71 @@

 }  // namespace fuzzer

+#elif LIBFUZZER_WINDOWS
+
+namespace fuzzer {
+
+//
+// The __start___libfuzzer_extra_counters variable is size 16 to account for
+// 16-byte alignment on amd64 and 8-byte alignment on x86. This means 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)).
+//
+// The section name, __libfuzzer_extra_counterr ends with "rr", so it is one
+// less than __libfuzzer_extra_counters ("rs") alphabetically. We want the start
+// symbol to be placed in the section just before the user supplied counters (if
+// present).
+//
+#pragma section(".data$__libfuzzer_extra_counterr")
+__declspec(allocate(".data$__libfuzzer_extra_counterr"))
+    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$__libfuzzer_extra_counterr" and ".data$__libfuzzer_extra_countert".
+// 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 dynamically computed by finding the difference
+// of __stop___libfuzzer_extra_counters and __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_countert ends with "rt", so it
+// is one more than __libfuzzer_extra_counters ("rs") alphabetically. We want
+// the stop symbol to be placed in the section just after the user supplied
+// counters (if present).
+//
+#pragma section(".data$__libfuzzer_extra_countert")
+__declspec(allocate(".data$__libfuzzer_extra_countert"))
+    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() {  // hand-written memset, don't asan-ify.
+  uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin());
+  uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd());
+  for (; Beg < End; Beg++) {
+    *Beg = 0;
+  }
+}
+
+}  // 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