diff --git a/.github/workflows/windows-ci.yml b/.github/workflows/windows-ci.yml
new file mode 100644
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+++ b/.github/workflows/windows-ci.yml
@@ -0,0 +1,119 @@
+#############################################################################
+#
+# Author: Jia Tan
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+#############################################################################
+
+name: Windows-CI
+
+# Only run the Windows CI manually since it takes much longer than the others.
+on: workflow_dispatch
+
+jobs:
+  POSIX:
+    strategy:
+      matrix:
+        # Test different environments since the code may change between
+        # them and we want to ensure that we support all potential users.
+        # clang64 currently fails due to a warning, so support will be
+        # added later.
+        system:
+          - mingw64
+          - mingw32
+          - ucrt64
+          - msys
+
+    # Set the shell to be msys2 as a default to avoid setting it for
+    # every individual run command.
+    defaults:
+      run:
+        shell: msys2 {0}
+
+    runs-on: windows-latest
+
+    steps:
+      #####################
+      # Setup Environment #
+      #####################
+
+      # Rely on the msys2 GitHub Action to set up the msys2 environment.
+      - name: Setup MSYS2
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: ${{ matrix.system }}
+          update: true
+          install: pactoys
+
+      - name: Checkout code
+        # Need to explicitly set the shell here since we set the default
+        # shell as msys2 earlier. This avoids an extra msys2 dependency on
+        # git.
+        shell: powershell
+        # Avoid Windows line endings. Otherwise test_scripts.sh will fail
+        # because the expected output is stored in the test framework as a
+        # text file and will not match the output from xzgrep.
+        run: git config --global core.autocrlf false
+
+      - uses: actions/checkout@v3
+
+
+      ########################
+      # Install Dependencies #
+      ########################
+
+        # The pacman repository has a different naming scheme for default
+        # msys packages than the others. The pacboy tool allows installing
+        # the packages possible in matrix setup without a burdensome amount
+        # of ifs.
+      - name: Install Dependencies
+        if: ${{ matrix.system == 'msys' }}
+        run: pacman --noconfirm -S --needed autotools base-devel doxygen gettext-devel gcc
+
+      - name: Install Dependencies
+        if: ${{ matrix.system != 'msys' }}
+        run: pacboy --noconfirm -S --needed autotools:p gcc:p clang:p make:p doxygen:p
+
+
+      ##################
+      # Build and Test #
+      ##################
+
+      - name: Build with full features
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -p build
+      - name: Test with full features
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -p test -n full_features
+
+      - name: Build without threads
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d threads,shared -p build
+      - name: Test without threads
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d threads,shared -p test -n no_threads
+
+      - name: Build without encoders
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d encoders,shared -p build
+      - name: Test without encoders
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d encoders,shared -p test -n no_encoders
+
+      - name: Build without decoders
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d decoders,shared -p build
+      - name: Test without decoders
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -d decoders,shared -p test -n no_decoders
+
+      - name: Build with only crc32 check
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -c crc32 -d shared,nls -p build
+      - name: Test with only crc32 check
+        run: ./build-aux/ci_build.sh -a "--no-po4a" -b autotools -c crc32 -d shared,nls -p test -n crc32_only
+
+
+      ###############
+      # Upload Logs #
+      ###############
+
+      # Upload the test logs as artifacts if any step has failed.
+      - uses: actions/upload-artifact@v3
+        if: ${{ failure() }}
+        with:
+          name: ${{ matrix.os }} ${{ matrix.build_system }} Test Logs
+          path: build-aux/artifacts