diff --git a/BUILD.bazel b/BUILD.bazel
index ca71eeb12f..ac2398a858 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -174,6 +174,23 @@ platform(
     ],
 )
 
+platform(
+    name = "gcc-windows-x86_64",
+    constraint_values = [
+        ":gcc",
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+)
+
+platform(
+    name = "windows-x86_64",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+)
+
 alias(
     name = "urbit",
     actual = "//pkg/vere:urbit",
diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
index 6ecc1294a7..ca1e0b4fe9 100644
--- a/WORKSPACE.bazel
+++ b/WORKSPACE.bazel
@@ -97,6 +97,7 @@ register_toolchains(
     "//bazel/toolchain:clang-linux-x86_64-toolchain",
     "//bazel/toolchain:clang-macos-arm64-toolchain",
     "//bazel/toolchain:gcc-linux-x86_64-toolchain",
+    "//bazel/toolchain:gcc-windows-x86_64-toolchain",
 )
 
 load("@rules_foreign_cc//foreign_cc:repositories.bzl", "rules_foreign_cc_dependencies")
diff --git a/bazel/toolchain/BUILD.bazel b/bazel/toolchain/BUILD.bazel
index 8511b7fb97..76ac12c8d1 100644
--- a/bazel/toolchain/BUILD.bazel
+++ b/bazel/toolchain/BUILD.bazel
@@ -247,3 +247,51 @@ toolchain(
     toolchain = ":clang-macos-arm64",
     toolchain_type = ":toolchain_type",
 )
+
+#
+# gcc-windows-x86_64
+#
+
+# Toolchain identifier.
+_windows_x86_64_gcc = "toolchain-gcc-windows-x86_64"
+
+cc_toolchain_config(
+    name = "gcc-windows-x86_64-config",
+    ar = "/c/ProgramData/chocolatey/bin/ar",
+    cc = "/c/ProgramData/chocolatey/bin/gcc",
+    compiler = "gcc",
+    compiler_version = "//:gcc_version",
+    ld = "/c/ProgramData/chocolatey/bin/ld",
+    sys_includes = [
+    ],
+    target_cpu = "x86_64",
+    toolchain_identifier = _windows_x86_64_gcc,
+)
+
+cc_toolchain(
+    name = "gcc-windows-x86_64",
+    all_files = ":empty",
+    compiler_files = ":empty",
+    dwp_files = ":empty",
+    linker_files = ":empty",
+    objcopy_files = ":empty",
+    strip_files = ":empty",
+    supports_param_files = 0,
+    toolchain_config = ":gcc-windows-x86_64-config",
+    toolchain_identifier = _windows_x86_64_gcc,
+)
+
+toolchain(
+    name = "gcc-windows-x86_64-toolchain",
+    exec_compatible_with = [
+        "//:gcc",
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+    target_compatible_with = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+    toolchain = ":gcc-windows-x86_64",
+    toolchain_type = ":toolchain_type",
+)