diff --git a/Userland/Libraries/LibCore/Environment.cpp b/Userland/Libraries/LibCore/Environment.cpp
index 13420928fa6..b377bf7f5fd 100644
--- a/Userland/Libraries/LibCore/Environment.cpp
+++ b/Userland/Libraries/LibCore/Environment.cpp
@@ -3,6 +3,7 @@
  * Copyright (c) 2021-2022, Kenneth Myhra <kennethmyhra@serenityos.org>
  * Copyright (c) 2021-2024, Sam Atkins <atkinssj@serenityos.org>
  * Copyright (c) 2022, Matthias Zimmerman <matthias291999@gmail.com>
+ * Copyright (c) 2024, stasoid <stasoid@yahoo.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -12,7 +13,7 @@
 
 #if defined(AK_OS_MACOS) || defined(AK_OS_IOS)
 #    include <crt_externs.h>
-#else
+#elif !defined(AK_OS_WINDOWS)
 extern "C" char** environ;
 #endif
 
@@ -93,8 +94,8 @@ Optional<StringView> get(StringView name, [[maybe_unused]] SecureOnly secure)
     builder.append('\0');
     // Note the explicit null terminators above.
 
-    // FreeBSD < 14, Android, and generic BSDs do not support secure_getenv.
-#if (defined(__FreeBSD__) && __FreeBSD__ >= 14) || (!defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID))
+    // FreeBSD < 14, Android, generic BSDs, and Windows do not support secure_getenv.
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 14) || (!defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID) && !defined(AK_OS_WINDOWS))
     char* result;
     if (secure == SecureOnly::Yes) {
         result = ::secure_getenv(builder.string_view().characters_without_null_termination());
@@ -119,7 +120,13 @@ ErrorOr<void> set(StringView name, StringView value, Overwrite overwrite)
     // Note the explicit null terminators above.
     auto c_name = builder.string_view().characters_without_null_termination();
     auto c_value = c_name + name.length() + 1;
+#ifndef AK_OS_WINDOWS
     auto rc = ::setenv(c_name, c_value, overwrite == Overwrite::Yes ? 1 : 0);
+#else
+    if (overwrite == Overwrite::No && getenv(c_name))
+        return {};
+    auto rc = _putenv_s(c_name, c_value);
+#endif
     if (rc < 0)
         return Error::from_errno(errno);
     return {};
@@ -130,9 +137,14 @@ ErrorOr<void> unset(StringView name)
     auto builder = TRY(StringBuilder::create());
     TRY(builder.try_append(name));
     TRY(builder.try_append('\0'));
-
     // Note the explicit null terminator above.
-    auto rc = ::unsetenv(builder.string_view().characters_without_null_termination());
+    auto c_name = builder.string_view().characters_without_null_termination();
+
+#ifndef AK_OS_WINDOWS
+    auto rc = ::unsetenv(c_name);
+#else
+    auto rc = _putenv_s(c_name, "");
+#endif
     if (rc < 0)
         return Error::from_errno(errno);
     return {};
@@ -142,6 +154,9 @@ ErrorOr<void> put(StringView env)
 {
 #if defined(AK_OS_SERENITY)
     auto rc = ::serenity_putenv(env.characters_without_null_termination(), env.length());
+#elif defined(AK_OS_WINDOWS)
+    ByteString str = env;
+    auto rc = ::putenv(str.characters());
 #else
     // Leak somewhat unavoidable here due to the putenv API.
     auto leaked_new_env = strndup(env.characters_without_null_termination(), env.length());
@@ -161,6 +176,16 @@ ErrorOr<void> clear()
     for (size_t environ_size = 0; environment[environ_size]; ++environ_size) {
         environment[environ_size] = NULL;
     }
+#elif defined(AK_OS_WINDOWS)
+    // environ = 0 doesn't work on Windows
+    while (auto str = environ[0]) {
+        auto eq = strchr(str, '=');
+        VERIFY(eq);
+        size_t name_len = eq - str;
+        auto result = unset({ str, name_len });
+        if (result.is_error())
+            return result;
+    }
 #else
     auto rc = ::clearenv();
     if (rc < 0)