diff --git a/catch2/build.sh b/catch2/build.sh
new file mode 100755
index 0000000..6919c89
--- /dev/null
+++ b/catch2/build.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd "$DIR"
+
+VERSION="v2.13.10"
+INSTALL_DIR="$DIR/catch2/install"
+
+if [ ! -d "catch2-src/.git" ]; then
+  rm -rf catch2-src
+  git clone --depth 1 https://github.com/catchorg/Catch2.git catch2-src
+fi
+git -C catch2-src fetch --depth 1 origin "$VERSION"
+git -C catch2-src checkout --force FETCH_HEAD
+
+rm -rf "$INSTALL_DIR"
+mkdir -p "$INSTALL_DIR/include"
+cp -r catch2-src/single_include/catch2 "$INSTALL_DIR/include/"
+
+echo "Installed catch2 to $INSTALL_DIR"
+du -sh "$INSTALL_DIR"
diff --git a/catch2/catch2/__init__.py b/catch2/catch2/__init__.py
new file mode 100644
index 0000000..ea730a7
--- /dev/null
+++ b/catch2/catch2/__init__.py
@@ -0,0 +1,9 @@
+import os
+
+DIR = os.path.join(os.path.dirname(__file__), "install")
+INCLUDE_DIR = os.path.join(DIR, "include")
+LIB_DIR = DIR  # header-only; no libraries
+
+
+def smoketest():
+  assert os.path.isfile(os.path.join(INCLUDE_DIR, "catch2", "catch.hpp")), "catch2/catch.hpp not found"
diff --git a/catch2/pyproject.toml b/catch2/pyproject.toml
new file mode 100644
index 0000000..2c8f6f8
--- /dev/null
+++ b/catch2/pyproject.toml
@@ -0,0 +1,16 @@
+[build-system]
+requires = ["setuptools>=64", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "catch2"
+version = "2.13.10"
+description = "Catch2 C++ test framework headers"
+requires-python = ">=3.8"
+
+[tool.setuptools.packages.find]
+include = ["catch2*"]
+exclude = ["catch2-src*"]
+
+[tool.setuptools.package-data]
+catch2 = ["install/**/*"]
diff --git a/catch2/setup.py b/catch2/setup.py
new file mode 100644
index 0000000..93d7f1e
--- /dev/null
+++ b/catch2/setup.py
@@ -0,0 +1,28 @@
+import os
+import subprocess
+
+from setuptools.command.build_py import build_py
+
+
+class BuildCatch2(build_py):
+  """Run build.sh to download Catch2 headers before collecting package data."""
+
+  def run(self):
+    pkg_dir = os.path.dirname(os.path.abspath(__file__))
+    build_script = os.path.join(pkg_dir, "build.sh")
+    subprocess.check_call(["bash", build_script], cwd=pkg_dir)
+
+    super().run()
+
+
+cmdclass = {"build_py": BuildCatch2}
+
+
+def setup():
+  from setuptools import setup as _setup
+
+  _setup(cmdclass=cmdclass)
+
+
+if __name__ == "__main__":
+  setup()
diff --git a/pyproject.toml b/pyproject.toml
index d65860c..575c582 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,7 @@
 members = [
   "bzip2",
   "capnproto",
+  "catch2",
   "cppcheck",
   "eigen",
   "ffmpeg",