diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index efd58bfbd6..d1eb1b525e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -420,6 +420,16 @@ jobs:
     - name: Install GCC problem matcher
       uses: ammaraskar/gcc-problem-matcher@master
 
+    - name: Import code signing certificates
+      uses: Apple-Actions/import-codesign-certs@v1
+      with:
+        # The certificates in a PKCS12 file encoded as a base64 string
+        p12-file-base64: ${{ secrets.APPLE_DEVELOPER_CERTIFICATE_P12_BASE64 }}
+        # The password used to import the PKCS12 file.
+        p12-password: ${{ secrets.APPLE_DEVELOPER_CERTIFICATE_PASSWORD }}
+      # If this is run on a fork, there may not be a certificate set up - continue in this case
+      continue-on-error: true
+
     - name: Build
       run: |
         mkdir build
@@ -432,6 +442,8 @@ jobs:
           -DCMAKE_TOOLCHAIN_FILE=/tmp/vcpkg/scripts/buildsystems/vcpkg.cmake \
           -DHOST_BINARY_DIR=${GITHUB_WORKSPACE}/build-host \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+          -DCPACK_BUNDLE_APPLE_CERT_APP=${{ secrets.APPLE_DEVELOPER_CERTIFICATE_ID }} \
+          "-DCPACK_BUNDLE_APPLE_CODESIGN_PARAMETER=--deep -f --options runtime" \
           # EOF
         echo "::endgroup::"
 
@@ -440,9 +452,21 @@ jobs:
         make -j$(sysctl -n hw.logicalcpu) package
         echo "::endgroup::"
 
-        # Remove the sha256 files CPack generates; we will do this ourself at
-        # the end of this workflow.
-        rm -f bundles/*.sha256
+    - name: Install gon
+      env:
+        HOMEBREW_NO_AUTO_UPDATE: 1
+        HOMEBREW_NO_INSTALL_CLEANUP: 1
+      run: |
+        brew tap mitchellh/gon
+        brew install mitchellh/gon/gon
+
+    - name: Notarize
+      env:
+        AC_USERNAME: ${{ secrets.APPLE_DEVELOPER_APP_USERNAME }}
+        AC_PASSWORD: ${{ secrets.APPLE_DEVELOPER_APP_PASSWORD }}
+      run: |
+        cd build
+        ../os/macosx/notarize.sh
 
     - name: Store bundles
       uses: actions/upload-artifact@v2
diff --git a/os/macosx/Info.plist.in b/os/macosx/Info.plist.in
index b3285589dd..04d6ea6d33 100644
--- a/os/macosx/Info.plist.in
+++ b/os/macosx/Info.plist.in
@@ -8,7 +8,7 @@
         <key>CFBundleDisplayName</key>
         <string>${CPACK_BUNDLE_NAME}</string>
         <key>CFBundleExecutable</key>
-        <string>${CPACK_BUNDLE_NAME}</string>
+        <string>openttd</string>
         <key>CFBundleGetInfoString</key>
         <string>#CPACK_PACKAGE_VERSION#, Copyright 2004-${CURRENT_YEAR} The OpenTTD team</string>
         <key>CFBundleIconFile</key>
diff --git a/os/macosx/notarize.sh b/os/macosx/notarize.sh
new file mode 100755
index 0000000000..3434c31256
--- /dev/null
+++ b/os/macosx/notarize.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+set -e
+
+# This script attempts to notarize the OpenTTD DMG generated by CPack.
+# If you are building an unofficial branch of OpenTTD, please change the bundle
+# ID in Info.plist and below.
+#
+# This uses `gon' to perform notarization:
+#
+#   https://github.com/mitchellh/gon
+#
+# Follow the setup instructions on the gon site to install.
+#
+# Before executing this script, you must first configure CMake with at least the following
+# parameters:
+#
+# -DCPACK_BUNDLE_APPLE_CERT_APP={certificate ID}
+# "-DCPACK_BUNDLE_APPLE_CODESIGN_PARAMETER=--deep -f --options runtime"
+#
+# then run "make package" or "cpack".
+#
+# This will sign the application with your signing certificate, and will enable
+# the hardened runtime.
+#
+# You also need to set your Apple Developer username and password (app-specific password
+# is recommended) in the AC_USERNAME and AC_PASSWORD environment variables.
+#
+# Then, ensuring you're in your build directory and that the "bundles" directory
+# exists with a .dmg in it (clear out any old DMGs first), run:
+#
+# ../os/macosx/notarize.sh
+
+if [ -z "${AC_USERNAME}" ]; then
+    echo AC_USERNAME not set, skipping notarization.
+    exit 0
+fi;
+
+dmg_filename=(bundles/*.dmg)
+
+if [ "${dmg_filename}" = "bundles/*.dmg" ]; then
+    echo "No .dmg found in the bundles directory, skipping notarization. Please read this"
+    echo "script's source for execution instructions."
+    exit 1
+fi;
+
+cat <<EOF > notarize.json
+{
+   "notarize": [
+      {
+         "path": "${dmg_filename[0]}",
+         "bundle_id": "org.openttd.openttd",
+         "staple": true
+      }
+   ]
+}
+EOF
+
+gon notarize.json