diff --git a/libc/config/gpu/entrypoints.txt b/libc/config/gpu/entrypoints.txt
index b008e0e6684fd..23acb2e95e4bb 100644
--- a/libc/config/gpu/entrypoints.txt
+++ b/libc/config/gpu/entrypoints.txt
@@ -261,6 +261,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.time.nanosleep
 
     # wchar.h entrypoints
+    libc.src.wchar.wcsstr
+    libc.src.wchar.wcspbrk
+    libc.src.wchar.wcsrchr
+    libc.src.wchar.wcschr
+    libc.src.wchar.wcslen
+    libc.src.wchar.wmemchr
     libc.src.wchar.wctob
 
     # locale.h entrypoints
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 00f0c6a8bfb8e..1491993f8041c 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -349,6 +349,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcsstr
+    libc.src.wchar.wcspbrk
+    libc.src.wchar.wcsrchr
+    libc.src.wchar.wcschr
+    libc.src.wchar.wcslen
+    libc.src.wchar.wmemchr
     libc.src.wchar.wctob
 )
 
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 49a8d61b93802..354acec4cc8bd 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -346,6 +346,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcsstr
+    libc.src.wchar.wcspbrk
+    libc.src.wchar.wcsrchr
+    libc.src.wchar.wcschr
+    libc.src.wchar.wcslen
+    libc.src.wchar.wmemchr
     libc.src.wchar.wctob
 )
 
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 7e549607716c0..ec095b493414c 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -348,6 +348,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcsstr
+    libc.src.wchar.wcspbrk
+    libc.src.wchar.wcsrchr
+    libc.src.wchar.wcschr
+    libc.src.wchar.wcslen
+    libc.src.wchar.wmemchr
     libc.src.wchar.wctob
     libc.src.wchar.btowc
 )
diff --git a/libc/hdrgen/yaml/wchar.yaml b/libc/hdrgen/yaml/wchar.yaml
index bc824b21d8be1..2ffcc45877156 100644
--- a/libc/hdrgen/yaml/wchar.yaml
+++ b/libc/hdrgen/yaml/wchar.yaml
@@ -14,3 +14,45 @@ functions:
     return_type: int
     arguments:
       - type: wint_t
+  - name: wmemchr
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: wchar_t
+      - type: size_t
+  - name: wcslen
+    standards:
+      - stdc
+    return_type: size_t
+    arguments:
+      - type: const wchar_t *
+  - name: wcschr
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: wchar_t
+  - name: wcsrchr
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: wchar_t
+  - name: wcspbrk
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: const wchar_t *
+  - name: wcsstr
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: const wchar_t *
diff --git a/libc/src/wchar/CMakeLists.txt b/libc/src/wchar/CMakeLists.txt
index d4c98ea527a8f..36609cd23a949 100644
--- a/libc/src/wchar/CMakeLists.txt
+++ b/libc/src/wchar/CMakeLists.txt
@@ -22,3 +22,72 @@ add_entrypoint_object(
     libc.hdr.wchar_macros
     libc.src.__support.wctype_utils
 )
+
+add_entrypoint_object(
+  wmemchr
+  SRCS
+    wmemchr.cpp
+  HDRS
+    wmemchr.h
+  DEPENDS
+    libc.hdr.types.size_t
+    libc.hdr.types.wchar_t
+    libc.src.__support.wctype_utils
+)
+
+add_entrypoint_object(
+  wcslen
+  SRCS
+    wcslen.cpp
+  HDRS
+    wcslen.h
+  DEPENDS
+    libc.hdr.types.size_t
+    libc.hdr.types.wchar_t
+    libc.src.__support.wctype_utils
+)
+
+add_entrypoint_object(
+  wcschr
+  SRCS
+    wcschr.cpp
+  HDRS
+    wcschr.h
+  DEPENDS
+    .wcslen
+    .wmemchr
+    libc.hdr.types.wchar_t
+)
+
+add_entrypoint_object(
+  wcsrchr
+  SRCS
+    wcsrchr.cpp
+  HDRS
+    wcsrchr.h
+  DEPENDS
+    .wcslen
+    libc.hdr.types.wchar_t
+)
+
+add_entrypoint_object(
+  wcspbrk
+  SRCS
+    wcspbrk.cpp
+  HDRS
+    wcspbrk.h
+  DEPENDS
+    .wcslen
+    libc.hdr.types.wchar_t
+)
+
+add_entrypoint_object(
+  wcsstr
+  SRCS
+    wcsstr.cpp
+  HDRS
+    wcsstr.h
+  DEPENDS
+    .wcslen
+    libc.hdr.types.wchar_t
+)
diff --git a/libc/src/wchar/wcschr.cpp b/libc/src/wchar/wcschr.cpp
new file mode 100644
index 0000000000000..ebb24a64f639e
--- /dev/null
+++ b/libc/src/wchar/wcschr.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of wcschr ------------------------------------------===//
+//
+// 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/wchar/wcschr.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "wcslen.h"
+#include "wmemchr.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcschr, (const wchar_t *s, wchar_t c)) {
+  return wmemchr(s, c, wcslen(s));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcschr.h b/libc/src/wchar/wcschr.h
new file mode 100644
index 0000000000000..6466d8e2ec2d6
--- /dev/null
+++ b/libc/src/wchar/wcschr.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for wmemchr -----------------------*- 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_WCHAR_WCSCHR_H
+#define LLVM_LIBC_SRC_WCHAR_WCSCHR_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcschr(const wchar_t *s, wchar_t c);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSCHR_H
diff --git a/libc/src/wchar/wcslen.cpp b/libc/src/wchar/wcslen.cpp
new file mode 100644
index 0000000000000..2e711af8b12bf
--- /dev/null
+++ b/libc/src/wchar/wcslen.cpp
@@ -0,0 +1,22 @@
+//===-- Implementation of wcslen ------------------------------------------===//
+//
+// 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/wchar/wcslen.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(size_t, wcslen, (const wchar_t *s)) {
+  size_t length = 0;
+  while (s[length++])
+    ;
+  return length;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcslen.h b/libc/src/wchar/wcslen.h
new file mode 100644
index 0000000000000..f472a1d5e9631
--- /dev/null
+++ b/libc/src/wchar/wcslen.h
@@ -0,0 +1,22 @@
+//===-- Implementation header for wcslen ------------------------*- 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_WCHAR_WCSLEN_H
+#define LLVM_LIBC_SRC_WCHAR_WCSLEN_H
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+size_t wcslen(const wchar_t *s);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSLEN_H
diff --git a/libc/src/wchar/wcspbrk.cpp b/libc/src/wchar/wcspbrk.cpp
new file mode 100644
index 0000000000000..ffdc037f87396
--- /dev/null
+++ b/libc/src/wchar/wcspbrk.cpp
@@ -0,0 +1,37 @@
+//===-- Implementation of wcspbrk -----------------------------------------===//
+//
+// 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/wchar/wcspbrk.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "wcslen.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcspbrk,
+                   (const wchar_t *wcs, const wchar_t *accept)) {
+  size_t n_accept = wcslen(accept);
+
+  for (size_t i = 0; i < wcslen(wcs); i++) {
+    bool accepted = true;
+
+    for (size_t x = 0; x < n_accept; i++) {
+      if (wcs[i] != accept[x]) {
+        accepted = false;
+        break;
+      }
+    }
+
+    if (!accepted)
+      continue;
+    return &wcs[i];
+  }
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcspbrk.h b/libc/src/wchar/wcspbrk.h
new file mode 100644
index 0000000000000..883f904368c32
--- /dev/null
+++ b/libc/src/wchar/wcspbrk.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for wcspbrk -----------------------*- 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_WCHAR_WCSPBRK_H
+#define LLVM_LIBC_SRC_WCHAR_WCSPBRK_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcspbrk(const wchar_t *wcs, const wchar_t *accept);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSPBRK_H
diff --git a/libc/src/wchar/wcsrchr.cpp b/libc/src/wchar/wcsrchr.cpp
new file mode 100644
index 0000000000000..a43ed30ce267b
--- /dev/null
+++ b/libc/src/wchar/wcsrchr.cpp
@@ -0,0 +1,26 @@
+//===-- Implementation of wcsrchr
+//------------------------------------------===//
+//
+// 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/wchar/wcsrchr.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "wcslen.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcsrchr, (const wchar_t *s, wchar_t c)) {
+  size_t length = wcslen(s);
+  for (size_t i = 0; i < length; i++) {
+    if (s[length - i] == c)
+      return &s[length - i];
+  }
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcsrchr.h b/libc/src/wchar/wcsrchr.h
new file mode 100644
index 0000000000000..8b4a3ef11c6b4
--- /dev/null
+++ b/libc/src/wchar/wcsrchr.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for wcsrchr -----------------------*- 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_WCHAR_WCSRCHR_H
+#define LLVM_LIBC_SRC_WCHAR_WCSRCHR_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcsrchr(const wchar_t *s, wchar_t c);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSRCHR_H
diff --git a/libc/src/wchar/wcsstr.cpp b/libc/src/wchar/wcsstr.cpp
new file mode 100644
index 0000000000000..084f854ef2335
--- /dev/null
+++ b/libc/src/wchar/wcsstr.cpp
@@ -0,0 +1,44 @@
+//===-- Implementation of wcsstr ------------------------------------------===//
+//
+// 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/wchar/wcsstr.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "wcslen.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcsstr,
+                   (const wchar_t *s, const wchar_t *needle)) {
+  size_t s_len = wcslen(s);
+  size_t needle_len = wcslen(needle);
+
+  if (needle_len > s_len)
+    return nullptr;
+
+  for (size_t i = 0; i < s_len; i++) {
+    size_t end = needle_len + i;
+    if (end > s_len)
+      break;
+
+    bool found = true;
+    for (size_t x = 0; x < needle_len; x++) {
+      if (s[i + x] != needle[x]) {
+        found = false;
+        break;
+      }
+    }
+
+    if (!found)
+      continue;
+    return &s[i];
+  }
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcsstr.h b/libc/src/wchar/wcsstr.h
new file mode 100644
index 0000000000000..15ccbf01ac9af
--- /dev/null
+++ b/libc/src/wchar/wcsstr.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for wcsstr ------------------------*- 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_WCHAR_WCSSTR_H
+#define LLVM_LIBC_SRC_WCHAR_WCSSTR_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcsstr(const wchar_t *s, const wchar_t *needle);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSSTR_H
diff --git a/libc/src/wchar/wmemchr.cpp b/libc/src/wchar/wmemchr.cpp
new file mode 100644
index 0000000000000..62191454343a8
--- /dev/null
+++ b/libc/src/wchar/wmemchr.cpp
@@ -0,0 +1,26 @@
+//===-- Implementation of wmemchr -----------------------------------------===//
+//
+// 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/wchar/wmemchr.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wmemchr,
+                   (const wchar_t *s, wchar_t c, size_t n)) {
+  for (size_t i = 0; i < n; i++) {
+    if (s[i] == c) {
+      return &s[i];
+    }
+  }
+
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wmemchr.h b/libc/src/wchar/wmemchr.h
new file mode 100644
index 0000000000000..e47a0a7573593
--- /dev/null
+++ b/libc/src/wchar/wmemchr.h
@@ -0,0 +1,22 @@
+//===-- Implementation header for wmemchr -----------------------*- 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_WCHAR_WMEMCHR_H
+#define LLVM_LIBC_SRC_WCHAR_WMEMCHR_H
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WMEMCHR_H