diff --git a/pre_commit/clientlib/validate_config.py b/pre_commit/clientlib/validate_config.py
index 1da54f91..8991850e 100644
--- a/pre_commit/clientlib/validate_config.py
+++ b/pre_commit/clientlib/validate_config.py
@@ -32,6 +32,7 @@ CONFIG_JSON_SCHEMA = {
                     'type': 'object',
                     'properties': {
                         'id': {'type': 'string'},
+                        'always_run': {'type': 'boolean'},
                         'files': {'type': 'string'},
                         'exclude': {'type': 'string'},
                         'language_version': {'type': 'string'},
diff --git a/pre_commit/clientlib/validate_manifest.py b/pre_commit/clientlib/validate_manifest.py
index 094c8e5d..d11ce2b8 100644
--- a/pre_commit/clientlib/validate_manifest.py
+++ b/pre_commit/clientlib/validate_manifest.py
@@ -17,6 +17,7 @@ MANIFEST_JSON_SCHEMA = {
         'type': 'object',
         'properties': {
             'id': {'type': 'string'},
+            'always_run': {'type': 'boolean', 'default': False},
             'name': {'type': 'string'},
             'description': {'type': 'string', 'default': ''},
             'entry': {'type': 'string'},
diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index e01c7f9f..f45e7089 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -76,7 +76,7 @@ def _run_single_hook(hook, repo, args, write, skips=frozenset()):
     if hook['id'] in skips:
         _print_user_skipped(hook, write, args)
         return 0
-    elif not filenames:
+    elif not filenames and not hook['always_run']:
         _print_no_files_skipped(hook, write, args)
         return 0
 
diff --git a/tests/commands/run_test.py b/tests/commands/run_test.py
index 120dce2a..a0795f28 100644
--- a/tests/commands/run_test.py
+++ b/tests/commands/run_test.py
@@ -184,6 +184,12 @@ def test_run(
     _test_run(repo_with_passing_hook, options, outputs, expected_ret, stage)
 
 
+def test_always_run(repo_with_passing_hook, mock_out_store_directory):
+    with modify_config() as config:
+        config[0]['hooks'][0]['always_run'] = True
+    _test_run(repo_with_passing_hook, {}, (b'Bash hook', b'Passed'), 0, False)
+
+
 @pytest.mark.parametrize(
     ('origin', 'source', 'expect_failure'),
     (
diff --git a/tests/manifest_test.py b/tests/manifest_test.py
index f28862ae..174f201f 100644
--- a/tests/manifest_test.py
+++ b/tests/manifest_test.py
@@ -19,6 +19,7 @@ def manifest(store, tempdir_factory):
 def test_manifest_contents(manifest):
     # Should just retrieve the manifest contents
     assert manifest.manifest_contents == [{
+        'always_run': False,
         'args': [],
         'description': '',
         'entry': 'bin/hook.sh',
@@ -35,6 +36,7 @@ def test_manifest_contents(manifest):
 
 def test_hooks(manifest):
     assert manifest.hooks['bash_hook'] == {
+        'always_run': False,
         'args': [],
         'description': '',
         'entry': 'bin/hook.sh',