diff --git a/.github/workflows/third_party_notices.yml b/.github/workflows/third_party_notices.yml
new file mode 100644
index 0000000000..24f63715d7
--- /dev/null
+++ b/.github/workflows/third_party_notices.yml
@@ -0,0 +1,19 @@
+---
+# yamllint disable rule:line-length
+name: Check for updated Third Party Notices
+
+on:  # yamllint disable-line rule:truthy
+  pull_request:
+
+jobs:
+  third-party-notices:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5.1.0
+        with:
+          python-version: '3.12'
+      - name: Run the generator
+        run: |
+          python Support/Python/unitybuild/generate_notice.py
+          git diff --exit-code
diff --git a/Support/Python/unitybuild/generate_notice.py b/Support/Python/unitybuild/generate_notice.py
new file mode 100644
index 0000000000..4b0f537e8f
--- /dev/null
+++ b/Support/Python/unitybuild/generate_notice.py
@@ -0,0 +1,83 @@
+# Copyright 2020 The Tilt Brush Authors
+# Copyright 2024 The Open Brush Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import io
+import re
+import codecs
+
+
+class BuildFailed(Exception):
+    pass
+
+
+def create_notice_file(project_dir):
+    def iter_notice_files():
+        """Yields (library_name, notice_file_name) tuples."""
+        root = os.path.join(project_dir, "Assets/ThirdParty")
+        if not os.path.exists(root):
+            raise BuildFailed("Cannot generate NOTICE: missing %s" % root)
+        for r, d, fs in os.walk(root):
+            d.sort()
+            for f in fs:
+                if f.lower() in (
+                    "notice",
+                    "notice.txt",
+                    "notice.tiltbrush",
+                    "notice.md",
+                ):
+                    yield (os.path.basename(r), os.path.join(r, f))
+        root = os.path.join(project_dir, "Assets/ThirdParty/NuGet/Packages")
+        if not os.path.exists(root):
+            raise BuildFailed("Cannot generate NOTICE: missing %s" % root)
+        for r, d, fs in os.walk(root):
+            d.sort()
+            for f in sorted(fs):
+                if f.lower() in ("notice", "notice.md", "notice.txt"):
+                    m = re.match(r"\D+", os.path.basename(r))
+                    if m:
+                        name = m.group(0).rstrip(".")
+                        if name[-2:] == ".v" or name[-2:] == ".V":
+                            name = name[:-2]
+                        yield (name, os.path.join(r, f))
+
+    tmpf = io.StringIO()
+    tmpf.write(
+        """This file is automatically generated.
+This software makes use of third-party software with the following notices.
+"""
+    )
+    for library_name, notice_file in iter_notice_files():
+        tmpf.write("\n\n=== %s ===\n" % library_name)
+        with open(notice_file) as inf:
+            contents = inf.read()
+            if contents.startswith(str(codecs.BOM_UTF8)):
+                contents = contents[len(codecs.BOM_UTF8) :]
+        tmpf.write(contents)
+        tmpf.write("\n")
+
+    output_filename = os.path.join(
+        project_dir, "Support/ThirdParty/GeneratedThirdPartyNotices.txt"
+    )
+    with open(output_filename, "w") as outf:
+        outf.write(tmpf.getvalue())
+
+
+def main(project_dir):
+    create_notice_file(project_dir)
+
+
+if __name__ == "__main__":
+    create_notice_file(os.getcwd())
diff --git a/Support/ThirdParty/GeneratedThirdPartyNotices.txt b/Support/ThirdParty/GeneratedThirdPartyNotices.txt
index bf36ac42bc..21960a551f 100644
--- a/Support/ThirdParty/GeneratedThirdPartyNotices.txt
+++ b/Support/ThirdParty/GeneratedThirdPartyNotices.txt
@@ -103,6 +103,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
 
+
+=== GraphicsAnton ===
+This product includes software developed by Anton Kirczenow.
+https://www.shadertoy.com/view/ldsGWX
+
+
 
 === Ionic.Zip ===
 DotNetZip - Copyright (c) 2006 - 2011 Dino Chiesa 
@@ -151,22 +157,3 @@ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-
-
-=== Usd ===
-Universal Scene Description   
-Copyright 2016 Pixar
-   
-All rights reserved.
-
-   
-
-This product includes software developed at:
-       
-Pixar (http://www.pixar.com/).
-
-
-=== GraphicsAnton ===
-This product includes software developed by Anton Kirczenow.
-https://www.shadertoy.com/view/ldsGWX
-