diff --git a/ircrobots/__init__.py b/ircrobots/__init__.py
index 5b798ed..6b4d641 100644
--- a/ircrobots/__init__.py
+++ b/ircrobots/__init__.py
@@ -1,5 +1,5 @@
 from .bot    import Bot
 from .server import Server
-from .params import (ConnectionParams, SASLUserPass, SASLExternal, SASLSCRAM,
+from .params import (ConnectionParams, ClientTLSCertificate, SASLUserPass, SASLExternal, SASLSCRAM,
     STSPolicy, ResumePolicy)
 from .ircv3  import Capability
diff --git a/ircrobots/interface.py b/ircrobots/interface.py
index f680f5f..29db989 100644
--- a/ircrobots/interface.py
+++ b/ircrobots/interface.py
@@ -5,7 +5,7 @@ from enum    import IntEnum
 from ircstates import Server, Emit
 from irctokens import Line, Hostmask
 
-from .params   import ConnectionParams, SASLParams, STSPolicy, ResumePolicy
+from .params   import ConnectionParams, SASLParams, STSPolicy, ResumePolicy, ClientTLSCertificate
 
 class ITCPReader(object):
     async def read(self, byte_count: int):
@@ -24,11 +24,12 @@ class ITCPWriter(object):
 
 class ITCPTransport(object):
     async def connect(self,
-            hostname:   str,
-            port:       int,
-            tls:        bool,
-            tls_verify: bool=True,
-            bindhost:   Optional[str]=None
+            hostname:    str,
+            port:        int,
+            tls:         bool,
+            tls_verify:  bool=True,
+            certificate: Optional[ClientTLSCertificate]=None,
+            bindhost:    Optional[str]=None
             ) -> Tuple[ITCPReader, ITCPWriter]:
         pass
 
diff --git a/ircrobots/params.py b/ircrobots/params.py
index 27117e3..ae02116 100644
--- a/ircrobots/params.py
+++ b/ircrobots/params.py
@@ -28,6 +28,12 @@ class ResumePolicy(object):
     address: str
     token:   str
 
+@dataclass
+class ClientTLSCertificate(object):
+    certfile: str
+    keyfile: Optional[str] = None
+    password: Optional[str] = None
+
 @dataclass
 class ConnectionParams(object):
     nickname: str
@@ -39,9 +45,10 @@ class ConnectionParams(object):
     realname: Optional[str] = None
     bindhost: Optional[str] = None
 
-    password:   Optional[str] = None
-    tls_verify: bool = True
-    sasl:       Optional[SASLParams] = None
+    password:    Optional[str] = None
+    tls_verify:  bool = True
+    sasl:        Optional[SASLParams] = None
+    certificate: Optional[ClientTLSCertificate] = None
 
     sts:    Optional[STSPolicy]    = None
     resume: Optional[ResumePolicy] = None
diff --git a/ircrobots/security.py b/ircrobots/security.py
index 17d1b78..31a3575 100644
--- a/ircrobots/security.py
+++ b/ircrobots/security.py
@@ -1,6 +1,13 @@
 import ssl
 
-def tls_context(verify: bool=True) -> ssl.SSLContext:
+from typing  import Optional
+from .params import ClientTLSCertificate
+
+def tls_context(
+    verify: bool=True,
+    certificate: Optional[ClientTLSCertificate]=None
+    ) -> ssl.SSLContext:
+
     context = ssl.SSLContext(ssl.PROTOCOL_TLS)
     context.options |= ssl.OP_NO_SSLv2
     context.options |= ssl.OP_NO_SSLv3
@@ -10,4 +17,11 @@ def tls_context(verify: bool=True) -> ssl.SSLContext:
     if verify:
         context.verify_mode = ssl.CERT_REQUIRED
 
+    if certificate is not None:
+        context.load_cert_chain(
+            certificate.certfile,
+            certificate.keyfile,
+            certificate.password
+        )
+
     return context
diff --git a/ircrobots/server.py b/ircrobots/server.py
index d916761..5c10b59 100644
--- a/ircrobots/server.py
+++ b/ircrobots/server.py
@@ -124,9 +124,10 @@ class Server(IServer):
         reader, writer = await transport.connect(
             params.host,
             params.port,
-            tls       =params.tls,
-            tls_verify=params.tls_verify,
-            bindhost  =params.bindhost)
+            tls        =params.tls,
+            tls_verify =params.tls_verify,
+            certificate=params.certificate,
+            bindhost   =params.bindhost)
 
         self._reader = reader
         self._writer = writer
diff --git a/ircrobots/transport.py b/ircrobots/transport.py
index 291409c..8dfaff2 100644
--- a/ircrobots/transport.py
+++ b/ircrobots/transport.py
@@ -4,6 +4,7 @@ from asyncio       import StreamReader, StreamWriter
 from async_stagger import open_connection
 
 from .interface import ITCPTransport, ITCPReader, ITCPWriter
+from .params    import ClientTLSCertificate
 from .security  import tls_context
 
 class TCPReader(ITCPReader):
@@ -32,16 +33,17 @@ class TCPWriter(ITCPWriter):
 
 class TCPTransport(ITCPTransport):
     async def connect(self,
-            hostname:   str,
-            port:       int,
-            tls:        bool,
-            tls_verify: bool=True,
-            bindhost:   Optional[str]=None
+            hostname:    str,
+            port:        int,
+            tls:         bool,
+            tls_verify:  bool=True,
+            certificate: Optional[ClientTLSCertificate]=None,
+            bindhost:    Optional[str]=None
             ) -> Tuple[ITCPReader, ITCPWriter]:
 
         cur_ssl: Optional[SSLContext] = None
         if tls:
-            cur_ssl = tls_context(tls_verify)
+            cur_ssl = tls_context(tls_verify, certificate)
 
         local_addr: Optional[Tuple[str, int]] = None
         if not bindhost is None: