diff --git a/tensorboard/plugins/core/core_plugin.py b/tensorboard/plugins/core/core_plugin.py
index cfc815e134..c43a4636fc 100644
--- a/tensorboard/plugins/core/core_plugin.py
+++ b/tensorboard/plugins/core/core_plugin.py
@@ -341,6 +341,21 @@ def define_flags(self, parser):
             % DEFAULT_PORT,
         )
 
+        parser.add_argument(
+            "--reuse_port",
+            metavar="BOOL",
+            # Custom str-to-bool converter since regular bool() doesn't work.
+            type=lambda v: {"true": True, "false": False}.get(v.lower(), v),
+            choices=[True, False],
+            default=False,
+            help="""\
+Enables the SO_REUSEPORT option on the socket opened by TensorBoard's HTTP
+server, for platforms that support it. This is useful in cases when a parent
+process has obtained the port already and wants to delegate access to the
+port to TensorBoard as a subprocess.(default: %(default)s).\
+""",
+        )
+
         parser.add_argument(
             "--load_fast",
             action="store_true",
diff --git a/tensorboard/plugins/core/core_plugin_test.py b/tensorboard/plugins/core/core_plugin_test.py
index 963cdd08c5..269356fb3e 100644
--- a/tensorboard/plugins/core/core_plugin_test.py
+++ b/tensorboard/plugins/core/core_plugin_test.py
@@ -57,6 +57,7 @@ def __init__(
         path_prefix="",
         generic_data="true",
         grpc_data_provider="",
+        reuse_port=False,
     ):
         self.bind_all = bind_all
         self.host = host
@@ -69,6 +70,7 @@ def __init__(
         self.path_prefix = path_prefix
         self.generic_data = generic_data
         self.grpc_data_provider = grpc_data_provider
+        self.reuse_port = reuse_port
 
 
 class CorePluginFlagsTest(tf.test.TestCase):
diff --git a/tensorboard/program.py b/tensorboard/program.py
index 5e77cec796..19c9cdc67e 100644
--- a/tensorboard/program.py
+++ b/tensorboard/program.py
@@ -682,13 +682,21 @@ def _get_wildcard_address(self, port):
         return fallback_address
 
     def server_bind(self):
-        """Override to enable IPV4 mapping for IPV6 sockets when desired.
+        """Override to set custom options on the socket."""
+        if self._flags.reuse_port:
+            try:
+                socket.SO_REUSEPORT
+            except AttributeError:
+                raise TensorBoardServerException(
+                    "TensorBoard --reuse_port option is not supported on this platform"
+                )
+            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
 
-        The main use case for this is so that when no host is specified,
-        TensorBoard can listen on all interfaces for both IPv4 and IPv6
-        connections, rather than having to choose v4 or v6 and hope the
-        browser didn't choose the other one.
-        """
+        # Enable IPV4 mapping for IPV6 sockets when desired.
+        # The main use case for this is so that when no host is specified,
+        # TensorBoard can listen on all interfaces for both IPv4 and IPv6
+        # connections, rather than having to choose v4 or v6 and hope the
+        # browser didn't choose the other one.
         socket_is_v6 = (
             hasattr(socket, "AF_INET6")
             and self.socket.family == socket.AF_INET6
diff --git a/tensorboard/program_test.py b/tensorboard/program_test.py
index b346c32b42..d878cbf4cf 100644
--- a/tensorboard/program_test.py
+++ b/tensorboard/program_test.py
@@ -89,6 +89,7 @@ def make_flags(self, **kwargs):
         flags = argparse.Namespace()
         kwargs.setdefault("host", None)
         kwargs.setdefault("bind_all", kwargs["host"] is None)
+        kwargs.setdefault("reuse_port", False)
         for k, v in kwargs.items():
             setattr(flags, k, v)
         return flags