diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -42,6 +42,7 @@
     libc.src.string.strcat
     libc.src.string.strchr
     libc.src.string.strcmp
+    libc.src.string.strcoll
     libc.src.string.strcpy
     libc.src.string.strcspn
     libc.src.string.strdup
diff --git a/libc/src/string/CMakeLists.txt b/libc/src/string/CMakeLists.txt
--- a/libc/src/string/CMakeLists.txt
+++ b/libc/src/string/CMakeLists.txt
@@ -96,6 +96,14 @@
     strcmp.h
 )
 
+add_entrypoint_object(
+  strcoll
+  SRCS
+    strcoll.cpp
+  HDRS
+    strcoll.h
+)
+
 add_entrypoint_object(
   strcpy
   SRCS
diff --git a/libc/src/string/strcoll.h b/libc/src/string/strcoll.h
new file mode 100644
--- /dev/null
+++ b/libc/src/string/strcoll.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for strcoll -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STRING_STRCOLL_H
+#define LLVM_LIBC_SRC_STRING_STRCOLL_H
+
+namespace __llvm_libc {
+
+int strcoll(const char *left, const char *right);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_STRING_STRCOLL_H
diff --git a/libc/src/string/strcoll.cpp b/libc/src/string/strcoll.cpp
new file mode 100644
--- /dev/null
+++ b/libc/src/string/strcoll.cpp
@@ -0,0 +1,22 @@
+//===-- Implementation of strcoll -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/string/strcoll.h"
+
+#include "src/__support/common.h"
+
+namespace __llvm_libc {
+
+// TODO: Add support for locales.
+LLVM_LIBC_FUNCTION(int, strcoll, (const char *left, const char *right)) {
+  for (; *left && *left == *right; ++left, ++right)
+    ;
+  return static_cast<int>(*left) - static_cast<int>(*right);
+}
+
+} // namespace __llvm_libc
diff --git a/libc/test/src/string/CMakeLists.txt b/libc/test/src/string/CMakeLists.txt
--- a/libc/test/src/string/CMakeLists.txt
+++ b/libc/test/src/string/CMakeLists.txt
@@ -92,6 +92,16 @@
     libc.src.string.strcmp
 )
 
+add_libc_unittest(
+  strcoll_test
+  SUITE
+    libc_string_unittests
+  SRCS
+    strcoll_test.cpp
+  DEPENDS
+    libc.src.string.strcoll
+)
+
 add_libc_unittest(
   strcpy_test
   SUITE
diff --git a/libc/test/src/string/strcoll_test.cpp b/libc/test/src/string/strcoll_test.cpp
new file mode 100644
--- /dev/null
+++ b/libc/test/src/string/strcoll_test.cpp
@@ -0,0 +1,30 @@
+//===-- Unittests for strcoll ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/string/strcoll.h"
+#include "utils/UnitTest/Test.h"
+
+// TODO: Add more comprehensive tests once locale support is added.
+
+TEST(LlvmLibcStrcollTest, SimpleTest) {
+  const char *s1 = "abc";
+  const char *s2 = "abc";
+  const char *s3 = "def";
+  int result = __llvm_libc::strcoll(s1, s2);
+  ASSERT_EQ(result, 0);
+
+  // Verify operands reversed.
+  result = __llvm_libc::strcoll(s2, s1);
+  ASSERT_EQ(result, 0);
+
+  result = __llvm_libc::strcoll(s1, s3);
+  ASSERT_LT(result, 0);
+
+  result = __llvm_libc::strcoll(s3, s1);
+  ASSERT_GT(result, 0);
+}