diff --git a/.github/workflows/publish-workflow-catalog.yml b/.github/workflows/publish-workflow-catalog.yml
new file mode 100644
index 0000000..71fac77
--- /dev/null
+++ b/.github/workflows/publish-workflow-catalog.yml
@@ -0,0 +1,62 @@
+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+name: Publish workflow catalog
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - 'workflow-templates/**'
+      - 'scripts/sync_catalog.py'
+      - '.github/workflows/publish-workflow-catalog.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    name: Publish organization workflow catalog
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout workflow source
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Checkout organization catalog
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          repository: LibreCodeCoop/.github
+          token: ${{ secrets.WORKFLOW_UPDATE_TOKEN }}
+          persist-credentials: false
+          path: catalog
+
+      - name: Synchronize workflow catalog
+        run: >-
+          python3 scripts/sync_catalog.py sync
+          workflow-templates
+          catalog/workflow-templates
+          --report catalog-sync-report.json
+
+      - name: Create catalog update pull request
+        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
+        with:
+          token: ${{ secrets.WORKFLOW_UPDATE_TOKEN }}
+          path: catalog
+          commit-message: 'chore: sync LibreCode workflow catalog'
+          committer: GitHub <noreply@github.com>
+          author: github-workflows bot <noreply@github.com>
+          signoff: true
+          branch: automated/sync-workflow-catalog
+          delete-branch: true
+          title: 'chore: sync workflow catalog'
+          body: |
+            Automated synchronization from `LibreCodeCoop/github-workflows`.
+
+            The files in `workflow-templates/` are generated and validated in the source repository. Review this pull request before publishing the updated organization catalog.
+          add-paths: |
+            workflow-templates/**
diff --git a/scripts/sync_catalog.py b/scripts/sync_catalog.py
new file mode 100644
index 0000000..b3322f8
--- /dev/null
+++ b/scripts/sync_catalog.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+from __future__ import annotations
+
+import argparse
+import json
+import shutil
+from pathlib import Path
+
+PUBLISHABLE_SUFFIXES = (".yml", ".yaml", ".properties.json", ".svg")
+
+
+def is_publishable(path: Path) -> bool:
+    return path.is_file() and path.name.endswith(PUBLISHABLE_SUFFIXES)
+
+
+def collect_publishable(directory: Path) -> dict[str, Path]:
+    if not directory.is_dir():
+        raise ValueError(f"directory does not exist: {directory}")
+
+    files = {
+        path.name: path
+        for path in directory.iterdir()
+        if is_publishable(path)
+    }
+    validate_catalog(files)
+    return files
+
+
+def validate_catalog(files: dict[str, Path]) -> None:
+    workflow_names: set[str] = set()
+
+    for name in files:
+        if name.endswith(".yml"):
+            workflow_names.add(name[:-4])
+        elif name.endswith(".yaml"):
+            workflow_names.add(name[:-5])
+
+    for workflow_name in workflow_names:
+        metadata_name = f"{workflow_name}.properties.json"
+        if metadata_name not in files:
+            raise ValueError(f"missing template metadata: {metadata_name}")
+
+    for name, path in files.items():
+        if not name.endswith(".properties.json"):
+            continue
+
+        workflow_name = name[: -len(".properties.json")]
+        if (
+            f"{workflow_name}.yml" not in files
+            and f"{workflow_name}.yaml" not in files
+        ):
+            raise ValueError(f"metadata has no matching workflow: {name}")
+
+        try:
+            metadata = json.loads(path.read_text(encoding="utf-8"))
+        except json.JSONDecodeError as error:
+            raise ValueError(f"invalid JSON in {name}: {error}") from error
+
+        if not isinstance(metadata, dict):
+            raise ValueError(f"metadata must be a JSON object: {name}")
+
+        icon_name = metadata.get("iconName")
+        if icon_name is not None:
+            if not isinstance(icon_name, str) or not icon_name:
+                raise ValueError(f"iconName must be a non-empty string: {name}")
+            if not icon_name.startswith("octicon "):
+                icon_file = f"{icon_name}.svg"
+                if icon_file not in files:
+                    raise ValueError(
+                        f"metadata references missing icon {icon_file}: {name}"
+                    )
+
+
+def sync_catalog(source: Path, target: Path) -> dict[str, list[str]]:
+    source_files = collect_publishable(source)
+    target.mkdir(parents=True, exist_ok=True)
+
+    target_files = {
+        path.name: path
+        for path in target.iterdir()
+        if is_publishable(path)
+    }
+
+    updated: list[str] = []
+    unchanged: list[str] = []
+    removed: list[str] = []
+
+    for name, source_path in sorted(source_files.items()):
+        target_path = target / name
+        source_content = source_path.read_bytes()
+
+        if target_path.is_file() and target_path.read_bytes() == source_content:
+            unchanged.append(name)
+            continue
+
+        shutil.copyfile(source_path, target_path)
+        updated.append(name)
+
+    for name, target_path in sorted(target_files.items()):
+        if name in source_files:
+            continue
+        target_path.unlink()
+        removed.append(name)
+
+    return {
+        "updated": updated,
+        "unchanged": unchanged,
+        "removed": removed,
+    }
+
+
+def check_catalog(source: Path, target: Path) -> None:
+    source_files = collect_publishable(source)
+    target_files = {
+        path.name: path
+        for path in target.iterdir()
+        if is_publishable(path)
+    } if target.is_dir() else {}
+
+    problems: list[str] = []
+
+    for name, source_path in sorted(source_files.items()):
+        target_path = target_files.get(name)
+        if target_path is None:
+            problems.append(f"missing from catalog: {name}")
+        elif target_path.read_bytes() != source_path.read_bytes():
+            problems.append(f"catalog file differs: {name}")
+
+    for name in sorted(set(target_files) - set(source_files)):
+        problems.append(f"stale catalog file: {name}")
+
+    if problems:
+        raise ValueError("; ".join(problems))
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("command", choices=("sync", "check"))
+    parser.add_argument("source", type=Path)
+    parser.add_argument("target", type=Path)
+    parser.add_argument("--report", type=Path)
+    args = parser.parse_args()
+
+    try:
+        if args.command == "sync":
+            report = sync_catalog(args.source, args.target)
+            if args.report:
+                args.report.write_text(
+                    json.dumps(report, indent=2, sort_keys=True) + "\n",
+                    encoding="utf-8",
+                )
+            print(json.dumps(report, indent=2, sort_keys=True))
+            return 0
+
+        check_catalog(args.source, args.target)
+    except (OSError, ValueError) as error:
+        parser.error(str(error))
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/test_sync_catalog.py b/tests/test_sync_catalog.py
new file mode 100644
index 0000000..b2512e1
--- /dev/null
+++ b/tests/test_sync_catalog.py
@@ -0,0 +1,121 @@
+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import json
+import tempfile
+import unittest
+from pathlib import Path
+
+from scripts.sync_catalog import check_catalog, collect_publishable, sync_catalog
+
+
+class SyncCatalogTest(unittest.TestCase):
+    def write_template(
+        self,
+        directory: Path,
+        name: str = "reuse",
+        *,
+        icon_name: str = "octicon verified",
+    ) -> None:
+        directory.mkdir(parents=True, exist_ok=True)
+        (directory / f"{name}.yml").write_text(
+            "name: Example\n",
+            encoding="utf-8",
+        )
+        (directory / f"{name}.properties.json").write_text(
+            json.dumps(
+                {
+                    "name": "Example",
+                    "description": "Example workflow",
+                    "iconName": icon_name,
+                }
+            )
+            + "\n",
+            encoding="utf-8",
+        )
+
+    def test_sync_adds_updates_and_removes_managed_files(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            source = root / "source"
+            target = root / "target"
+            self.write_template(source)
+
+            target.mkdir()
+            (target / "reuse.yml").write_text("name: Old\n", encoding="utf-8")
+            (target / "old.yml").write_text("name: Old\n", encoding="utf-8")
+            (target / "old.properties.json").write_text("{}\n", encoding="utf-8")
+            (target / "README.md").write_text("keep me\n", encoding="utf-8")
+
+            report = sync_catalog(source, target)
+
+            self.assertEqual(report["updated"], ["reuse.properties.json", "reuse.yml"])
+            self.assertEqual(report["removed"], ["old.properties.json", "old.yml"])
+            self.assertTrue((target / "README.md").is_file())
+            check_catalog(source, target)
+
+    def test_sync_reports_unchanged_files(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            source = root / "source"
+            target = root / "target"
+            self.write_template(source)
+            sync_catalog(source, target)
+
+            report = sync_catalog(source, target)
+
+            self.assertEqual(report["updated"], [])
+            self.assertEqual(
+                report["unchanged"],
+                ["reuse.properties.json", "reuse.yml"],
+            )
+            self.assertEqual(report["removed"], [])
+
+    def test_requires_metadata_for_each_workflow(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            source = Path(directory)
+            (source / "reuse.yml").write_text("name: Example\n", encoding="utf-8")
+
+            with self.assertRaisesRegex(ValueError, "missing template metadata"):
+                collect_publishable(source)
+
+    def test_rejects_metadata_without_matching_workflow(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            source = Path(directory)
+            (source / "reuse.properties.json").write_text(
+                '{"name":"Example"}\n',
+                encoding="utf-8",
+            )
+
+            with self.assertRaisesRegex(ValueError, "no matching workflow"):
+                collect_publishable(source)
+
+    def test_requires_custom_svg_icon(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            source = Path(directory)
+            self.write_template(source, icon_name="custom-icon")
+
+            with self.assertRaisesRegex(ValueError, "missing icon custom-icon.svg"):
+                collect_publishable(source)
+
+            (source / "custom-icon.svg").write_text(
+                "<svg></svg>\n",
+                encoding="utf-8",
+            )
+            collect_publishable(source)
+
+    def test_check_detects_drift(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            source = root / "source"
+            target = root / "target"
+            self.write_template(source)
+            sync_catalog(source, target)
+            (target / "reuse.yml").write_text("name: Drift\n", encoding="utf-8")
+
+            with self.assertRaisesRegex(ValueError, "catalog file differs"):
+                check_catalog(source, target)
+
+
+if __name__ == "__main__":
+    unittest.main()