diff --git a/.flake8 b/.flake8
index c58d00ca05..22eebf3de4 100644
--- a/.flake8
+++ b/.flake8
@@ -4,7 +4,6 @@ exclude =
  ./third_party/, # third-party code
  ./build/, # third-party code
  ./buildtools/, # third-party code
- ./tools/swarming_client/, # third-party code
  ./test/wasm-js/, # third-party code
  ./test/wasm-js/data/, # third-party code
  ./test/test262/data/, # third-party code
diff --git a/.gitignore b/.gitignore
index 895ac2eca1..950407db07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -81,7 +81,6 @@
 /tools/luci-go
 /tools/oom_dump/oom_dump
 /tools/oom_dump/oom_dump.o
-/tools/swarming_client
 /tools/turbolizer/build
 /tools/turbolizer/.rpt2_cache
 /tools/turbolizer/deploy
diff --git a/DEPS b/DEPS
index 4296f1d9cd..5b5923d61e 100644
--- a/DEPS
+++ b/DEPS
@@ -314,8 +314,6 @@ deps = {
       'condition': 'host_cpu != "s390" and host_os != "aix"',
       'dep_type': 'cipd',
   },
-  'tools/swarming_client':
-    Var('chromium_url') + '/infra/luci/client-py.git' + '@' + 'a32a1607f6093d338f756c7e7c7b4333b0c50c9c',
 }
 
 include_rules = [
diff --git a/tools/mb/mb.py b/tools/mb/mb.py
index 7031ba50db..eb3912557d 100755
--- a/tools/mb/mb.py
+++ b/tools/mb/mb.py
@@ -223,8 +223,6 @@ class MetaBuildWrapper(object):
                             ' This can be either a regular path or a '
                             'GN-style source-relative path like '
                             '//out/Default.'))
-    subp.add_argument('-s', '--swarmed', action='store_true',
-                      help='Run under swarming with the default dimensions')
     subp.add_argument('-d', '--dimension', default=[], action='append', nargs=2,
                       dest='dimensions', metavar='FOO bar',
                       help='dimension to filter on')
@@ -356,67 +354,7 @@ class MetaBuildWrapper(object):
     if ret:
       return ret
 
-    if self.args.swarmed:
-      return self._RunUnderSwarming(build_dir, target)
-    else:
-      return self._RunLocallyIsolated(build_dir, target)
-
-  def _RunUnderSwarming(self, build_dir, target):
-    # TODO(dpranke): Look up the information for the target in
-    # the //testing/buildbot.json file, if possible, so that we
-    # can determine the isolate target, command line, and additional
-    # swarming parameters, if possible.
-    #
-    # TODO(dpranke): Also, add support for sharding and merging results.
-    # TODO(liviurau): While this seems to not be used in V8 yet, we need to add
-    # a switch for internal try-bots, since they need to use 'chrome-swarming'
-    cas_instance = 'chromium-swarm'
-    dimensions = []
-    for k, v in self._DefaultDimensions() + self.args.dimensions:
-      dimensions += ['-d', k, v]
-
-    archive_json_path = self.ToSrcRelPath(
-        '%s/%s.archive.json' % (build_dir, target))
-    cmd = [
-        self.PathJoin(self.chromium_src_dir, 'tools', 'luci-go',
-                      self.isolate_exe),
-        'archive',
-        '-i',
-        self.ToSrcRelPath('%s/%s.isolate' % (build_dir, target)),
-        '-cas-instance', cas_instance,
-        '-dump-json',
-        archive_json_path,
-      ]
-    ret, _, _ = self.Run(cmd, force_verbose=False)
-    if ret:
-      return ret
-
-    try:
-      archive_hashes = json.loads(self.ReadFile(archive_json_path))
-    except Exception:
-      self.Print(
-          'Failed to read JSON file "%s"' % archive_json_path, file=sys.stderr)
-      return 1
-    try:
-      cas_digest = archive_hashes[target]
-    except Exception:
-      self.Print(
-          'Cannot find hash for "%s" in "%s", file content: %s' %
-          (target, archive_json_path, archive_hashes),
-          file=sys.stderr)
-      return 1
-
-    cmd = [
-        self.executable,
-        self.PathJoin('tools', 'swarming_client', 'swarming.py'),
-          'run',
-          '-digests', cas_digest,
-          '-S', 'chromium-swarm.appspot.com',
-      ] + dimensions
-    if self.args.extra_args:
-      cmd += ['--'] + self.args.extra_args
-    ret, _, _ = self.Run(cmd, force_verbose=True, buffer_output=False)
-    return ret
+    return self._RunLocallyIsolated(build_dir, target)
 
   def _RunLocallyIsolated(self, build_dir, target):
     cmd = [
diff --git a/tools/mb/mb_unittest.py b/tools/mb/mb_unittest.py
index 4c67495de4..86d9cd403b 100755
--- a/tools/mb/mb_unittest.py
+++ b/tools/mb/mb_unittest.py
@@ -523,28 +523,6 @@ class UnitTest(unittest.TestCase):
     self.check(['run', '-c', 'debug_goma', '//out/Default',
                 'base_unittests'], files=files, ret=0)
 
-  def test_run_swarmed(self):
-    files = {
-      '/fake_src/testing/buildbot/gn_isolate_map.pyl': (
-          "{'base_unittests': {"
-          "  'label': '//base:base_unittests',"
-          "  'type': 'raw',"
-          "  'args': [],"
-          "}}\n"
-      ),
-      '/fake_src/out/Default/base_unittests.runtime_deps': (
-          "base_unittests\n"
-      ),
-      'out/Default/base_unittests.archive.json':
-        ("{\"base_unittests\":\"fake_hash\"}"),
-    }
-
-    mbw = self.fake_mbw(files=files)
-    self.check(['run', '-s', '-c', 'debug_goma', '//out/Default',
-                'base_unittests'], mbw=mbw, ret=0)
-    self.check(['run', '-s', '-c', 'debug_goma', '-d', 'os', 'Win7',
-                '//out/Default', 'base_unittests'], mbw=mbw, ret=0)
-
   def test_lookup(self):
     self.check(['lookup', '-c', 'debug_goma'], ret=0,
                out=('\n'