diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9e9adccf3..0ba8a60d1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,14 +8,31 @@ on:
 
 jobs:
   test:
-    name: ./test.sh
+    name: ./test.sh (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: ['macos-latest', 'ubuntu-latest', 'ubuntu-24.04-arm']
+        include:
+          - os: macos-latest
+          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
+          - os: windows-latest
+            shell: msys2 {0}
+            timeout: 5  # the build and the install test take longer on the 4-core GitHub-hosted runner
+    defaults:
+      run:
+        shell: ${{ matrix.shell || 'bash -e {0}' }}
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v7
+      - uses: msys2/setup-msys2@v2
+        if: runner.os == 'Windows'
+        with:
+          msystem: CLANG64
+          path-type: inherit  # uv and Git for Windows stay visible
+          install: mingw-w64-clang-x86_64-clang  # for scons
+      - uses: astral-sh/setup-uv@v5
+        if: runner.os == 'Windows'
       - run: ./test.sh
-        timeout-minutes: 1
+        timeout-minutes: ${{ matrix.timeout || 1 }}
diff --git a/SConstruct b/SConstruct
index b7e1a4c76..d9330a517 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1,14 +1,17 @@
 import os
 import platform
 import subprocess
+import sys
 import sysconfig
 
+WINDOWS = platform.system() == "Windows"
 arch = subprocess.check_output(["uname", "-m"], encoding='utf8').rstrip()
 if platform.system() == "Darwin":
   arch = "Darwin"
 
-# shm_open/shm_unlink live in librt on older glibc versions (including manylinux).
-common = [] if arch == "Darwin" else ["rt"]
+# shm_open/shm_unlink live in librt on older glibc versions (including manylinux);
+# on Windows visionipc's sockets come from winsock
+common = {"Linux": ["rt"], "Windows": ["ws2_32"]}.get(platform.system(), [])
 
 cpppath = [
   "#/",
@@ -63,8 +66,11 @@ env = Environment(
   CXXFLAGS="-std=c++1z",
   CPPPATH=cpppath,
   CYTHONCFILESUFFIX=".cpp",
-  tools=["default", "cython"]
+  tools=["mingw" if WINDOWS else "default", "cython"],  # the default tool picks MSVC on Windows
 )
+if WINDOWS:
+  env["CC"], env["CXX"] = "clang", "clang++"  # the mingw tool assumes gcc
+  env.Append(LINKFLAGS=["-static"])  # libc++ into the binaries so they run outside the MSYS2 shell
 
 Export('env', 'arch', 'common')
 
@@ -73,6 +79,10 @@ envCython["CCFLAGS"] += ["-Wno-#warnings", "-Wno-cpp", "-Wno-shadow", "-Wno-depr
 envCython["CCFLAGS"].remove('-Werror')
 if arch == "Darwin":
   envCython["LINKFLAGS"] = ["-bundle", "-undefined", "dynamic_lookup"]
+elif WINDOWS:
+  envCython["LINKFLAGS"] = ["-shared", "-static"]
+  envCython.Append(LIBPATH=[os.path.join(sys.base_prefix, "libs")])
+  envCython["LIBS"] = [f"python{sys.version_info.major}{sys.version_info.minor}"]
 else:
   envCython["LINKFLAGS"] = ["-pthread", "-shared"]
 
diff --git a/setup.py b/setup.py
index 45e2c172d..1bb741ec6 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ class SConsBuildExt(build_ext):
   def build_extensions(self):
     subprocess.check_call([sys.executable, "-m", "SCons", "--minimal", "-j", str(self.parallel or os.cpu_count() or 1)])
     for ext in self.extensions:
-      source = Path(*ext.name.split(".")).with_suffix(".so")
+      source = Path(*ext.name.split(".")).with_suffix(".pyd" if sys.platform == "win32" else ".so")
       target = Path(self.get_ext_fullpath(ext.name))
       target.parent.mkdir(parents=True, exist_ok=True)
       self.copy_file(str(source), str(target))
diff --git a/setup.sh b/setup.sh
index 09e3af82c..a5429e5cd 100755
--- a/setup.sh
+++ b/setup.sh
@@ -14,6 +14,15 @@ if ! command -v uv &>/dev/null; then
   set -e
 fi
 
+VENV_BIN=bin
+EXE=""
+case "$(uname -s)" in MINGW*|MSYS*)
+  VENV_BIN=Scripts  # a native Python's venv keeps its scripts in Scripts/
+  EXE=".exe"
+  export UV_PYTHON="${UV_PYTHON:-3.12}"  # not the MSYS2 toolchain's own python, whose wheels are incompatible
+  ;;
+esac
+
 export UV_PROJECT_ENVIRONMENT="$DIR/.venv"
 uv sync --all-extras
-source "$DIR/.venv/bin/activate"
+source "$DIR/.venv/$VENV_BIN/activate"
diff --git a/test.sh b/test.sh
index bf3a0e0ef..df4688c0b 100755
--- a/test.sh
+++ b/test.sh
@@ -16,10 +16,11 @@ lefthook run test
 (
   TEST_DIR=$(mktemp -d)
   trap 'rm -rf "$TEST_DIR"' EXIT
-  uv venv --python "$DIR/.venv/bin/python" "$TEST_DIR/.venv"
-  uv pip install --python "$TEST_DIR/.venv/bin/python" "$DIR"
+  uv venv --python "$DIR/.venv/$VENV_BIN/python$EXE" "$TEST_DIR/.venv"
+  TEST_PYTHON="$TEST_DIR/.venv/$VENV_BIN/python$EXE"
+  uv pip install --python "$TEST_PYTHON" "$DIR"
   cd "$TEST_DIR"
-  "$TEST_DIR/.venv/bin/python" -m unittest msgq.tests.test_messaging
+  "$TEST_PYTHON" -m unittest msgq.tests.test_messaging
 )
 
 # *** all done ***