diff --git a/ryu/lib/ofctl_string.py b/ryu/lib/ofctl_string.py
index 06a91af2..30394c65 100644
--- a/ryu/lib/ofctl_string.py
+++ b/ryu/lib/ofctl_string.py
@@ -322,3 +322,7 @@ class OfctlActionConverter(object):
                                 'recirc_table': recirc_table,
                                 'alg': alg,
                                 'actions': ct_actions})
+
+    @classmethod
+    def ct_clear(cls, ofproto, action_str):
+        return dict(NXActionCTClear={})
diff --git a/ryu/ofproto/nicira_ext.py b/ryu/ofproto/nicira_ext.py
index 4a06b647..73297cfb 100644
--- a/ryu/ofproto/nicira_ext.py
+++ b/ryu/ofproto/nicira_ext.py
@@ -62,6 +62,7 @@ NXAST_NAT = 36
 NXAST_CONTROLLER2 = 37
 NXAST_SAMPLE2 = 38
 NXAST_OUTPUT_TRUNC = 39
+NXAST_CT_CLEAR = 43
 NXAST_DEC_NSH_TTL = 48
 
 NX_ACTION_RESUBMIT_PACK_STR = '!HHIHHB3x'
diff --git a/ryu/ofproto/nx_actions.py b/ryu/ofproto/nx_actions.py
index 18dc9210..ae5c48f4 100644
--- a/ryu/ofproto/nx_actions.py
+++ b/ryu/ofproto/nx_actions.py
@@ -2766,6 +2766,43 @@ def generate(ofp_name, ofpp_name):
                 a.serialize(data, len(data))
             return data
 
+    class NXActionCTClear(NXAction):
+        """
+        Clear connection tracking state action
+
+        This action clears connection tracking state from packets.
+
+        And equivalent to the followings action of ovs-ofctl command.
+
+        ..
+          ct_clear
+        ..
+
+        +--------------+
+        | **ct_clear** |
+        +--------------+
+
+        Example::
+
+            actions += [parser.NXActionCTClear()]
+        """
+        _subtype = nicira_ext.NXAST_CT_CLEAR
+
+        _fmt_str = '!6x'
+
+        def __init__(self,
+                     type_=None, len_=None, experimenter=None, subtype=None):
+            super(NXActionCTClear, self).__init__()
+
+        @classmethod
+        def parser(cls, buf):
+            return cls()
+
+        def serialize_body(self):
+            data = bytearray()
+            msg_pack_into(self._fmt_str, data, 0)
+            return data
+
     class NXActionNAT(NXAction):
         """
         Network address translation action
@@ -3061,6 +3098,7 @@ def generate(ofp_name, ofpp_name):
         'NXActionBundle',
         'NXActionBundleLoad',
         'NXActionCT',
+        'NXActionCTClear',
         'NXActionNAT',
         'NXActionOutputTrunc',
         '_NXFlowSpec',  # exported for testing
diff --git a/ryu/tests/packet_data/of13/ovs-ofctl-of13-action_ct_clear.packet b/ryu/tests/packet_data/of13/ovs-ofctl-of13-action_ct_clear.packet
new file mode 100644
index 00000000..13bc3901
Binary files /dev/null and b/ryu/tests/packet_data/of13/ovs-ofctl-of13-action_ct_clear.packet differ
diff --git a/ryu/tests/packet_data_generator3/gen.py b/ryu/tests/packet_data_generator3/gen.py
index 0216dc42..dca45cf9 100644
--- a/ryu/tests/packet_data_generator3/gen.py
+++ b/ryu/tests/packet_data_generator3/gen.py
@@ -131,6 +131,13 @@ MESSAGES = [
                'importance=39032'] +
               ['dl_type=0x86dd'] +
               ['actions=ct(commit,nat(dst=2001:1::1-2001:1::ffff)'])},
+    {'name': 'action_ct_clear',
+     'versions': [4],
+     'cmd': 'add-flow',
+     'args': (['table=3,',
+               'importance=39032'] +
+              ['dl_type=0x0800,ct_state=+trk'] +
+              ['actions=ct_clear'])},
     {'name': 'action_note',
      'versions': [4],
      'cmd': 'add-flow',
diff --git a/ryu/tests/unit/ofproto/json/of13/ovs-ofctl-of13-action_ct_clear.packet.json b/ryu/tests/unit/ofproto/json/of13/ovs-ofctl-of13-action_ct_clear.packet.json
new file mode 100644
index 00000000..32b88b72
--- /dev/null
+++ b/ryu/tests/unit/ofproto/json/of13/ovs-ofctl-of13-action_ct_clear.packet.json
@@ -0,0 +1,55 @@
+{
+   "OFPFlowMod": {
+      "buffer_id": 4294967295, 
+      "command": 0, 
+      "cookie": 0, 
+      "cookie_mask": 0, 
+      "flags": 0, 
+      "hard_timeout": 0, 
+      "idle_timeout": 0, 
+      "instructions": [
+         {
+            "OFPInstructionActions": {
+               "actions": [
+                  {
+                     "NXActionCTClear": {
+                        "experimenter": 8992, 
+                        "len": 16, 
+                        "subtype": 43, 
+                        "type": 65535
+                     }
+                  }
+               ], 
+               "len": 24, 
+               "type": 4
+            }
+         }
+      ], 
+      "match": {
+         "OFPMatch": {
+            "length": 22, 
+            "oxm_fields": [
+               {
+                  "OXMTlv": {
+                     "field": "eth_type", 
+                     "mask": null, 
+                     "value": 2048
+                  }
+               }, 
+               {
+                  "OXMTlv": {
+                     "field": "ct_state", 
+                     "mask": 32, 
+                     "value": 32
+                  }
+               }
+            ], 
+            "type": 1
+         }
+      }, 
+      "out_group": 4294967295, 
+      "out_port": 4294967295, 
+      "priority": 32768, 
+      "table_id": 3
+   }
+}