diff --git a/tools/topology_graphviz.py b/tools/topology_graphviz.py
new file mode 100755
index 00000000..e7884fc8
--- /dev/null
+++ b/tools/topology_graphviz.py
@@ -0,0 +1,33 @@
+#! /usr/bin/env python
+
+# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
+# Copyright (C) 2013 YAMAMOTO Takashi <yamamoto at valinux co jp>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# usage example:
+# curl http://localhost:8080/v1.0/topology/links|./topology_graphviz.py|neato -Tx11
+
+import json
+import sys
+
+j = sys.stdin.read()
+l = json.loads(j)
+
+print 'digraph {'
+print 'node [shape=box]'
+for d in l:
+    print '"%s" -> "%s";' % (d['src']['dpid'], d['dst']['dpid'])
+print 'overlap=false'
+print '}'