diff --git a/contrib/packaging/pyoxidizer.bzl b/contrib/packaging/pyoxidizer.bzl
new file mode 100644
--- /dev/null
+++ b/contrib/packaging/pyoxidizer.bzl
@@ -0,0 +1,57 @@
+# Instructions:
+#
+# 1. cargo install --version 0.5.0 pyoxidizer
+# 2. cd /path/to/hg
+# 3. pyoxidizer build --path contrib/packaging [--release]
+# 4. Run build/pyoxidizer/<arch>/<debug|release>/app/hg
+#
+# If you need to build again, you need to remove the build/lib.* and
+# build/temp.* directories, otherwise PyOxidizer fails to pick up C
+# extensions. This is a bug in PyOxidizer.
+
+ROOT = CWD + "/../.."
+
+set_build_path(ROOT + "/build/pyoxidizer")
+
+def make_exe():
+    dist = default_python_distribution()
+
+    code = "import hgdemandimport; hgdemandimport.enable(); from mercurial import dispatch; dispatch.run()"
+
+    config = PythonInterpreterConfig(
+        raw_allocator = "system",
+        run_eval = code,
+        # We need this to make resourceutil happy, since it looks for sys.frozen.
+        sys_frozen = True,
+    )
+
+    exe = dist.to_python_executable(
+        name = "hg",
+        config = config,
+    )
+
+    # Use setup.py install to build Mercurial and collect Python resources to
+    # embed in the executable.
+    resources = dist.setup_py_install(ROOT)
+    exe.add_python_resources(resources)
+
+    return exe
+
+def make_install(exe):
+    m = FileManifest()
+
+    # `hg` goes in root directory.
+    m.add_python_resource(".", exe)
+
+    templates = glob(
+        include=[ROOT + "/mercurial/templates/**/*"],
+        strip_prefix = ROOT + "/mercurial/",
+    )
+    m.add_manifest(templates)
+
+    return m
+
+register_target("exe", make_exe)
+register_target("app", make_install, depends = ["exe"], default = True)
+
+resolve_targets()