diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index 779322df1..f86b1852c 100644
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -1323,6 +1323,53 @@ class SecurityGroupBackend(object):
 
         raise InvalidPermissionNotFoundError()
 
+    def authorize_security_group_egress(self,
+                                        group_name_or_id,
+                                        ip_protocol,
+                                        from_port,
+                                        to_port,
+                                        ip_ranges,
+                                        src_group_id=None,
+                                        cidr_ip=None,
+                                        vpc_id=None):
+
+        group = self.get_security_group_by_name_or_id(group_name_or_id, vpc_id)
+
+        if ip_ranges and not isinstance(ip_ranges, list):
+            ip_ranges = [ip_ranges]
+
+        # for VPCs
+        source_groups = []
+        source_group = self.get_security_group_from_id(src_group_id)
+        if source_group:
+            source_groups.append(source_group)
+        security_rule = SecurityRule(ip_protocol, from_port, to_port, ip_ranges, source_groups)
+        group.egress_rules.append(security_rule)
+
+    def revoke_security_group_egress(self,
+                                     group_name_or_id,
+                                     ip_protocol,
+                                     from_port,
+                                     to_port,
+                                     ip_ranges,
+                                     source_group_names=None,
+                                     source_group_ids=None,
+                                     vpc_id=None):
+
+        group = self.get_security_group_by_name_or_id(group_name_or_id, vpc_id)
+
+        source_groups = []
+        for source_group_name in source_group_names:
+            source_group = self.get_security_group_from_name(source_group_name, vpc_id)
+            if source_group:
+                source_groups.append(source_group)
+
+        security_rule = SecurityRule(ip_protocol, from_port, to_port, ip_ranges, source_groups)
+        if security_rule in group.egress_rules:
+            group.egress_rules.remove(security_rule)
+            return security_rule
+        raise InvalidPermissionNotFoundError()
+
 
 class SecurityGroupIngress(object):
 
diff --git a/moto/ec2/responses/security_groups.py b/moto/ec2/responses/security_groups.py
index 9a9aaafd9..55c996fff 100644
--- a/moto/ec2/responses/security_groups.py
+++ b/moto/ec2/responses/security_groups.py
@@ -31,7 +31,8 @@ def process_rules_from_querystring(querystring):
 
 class SecurityGroups(BaseResponse):
     def authorize_security_group_egress(self):
-        raise NotImplementedError('SecurityGroups.authorize_security_group_egress is not yet implemented')
+        self.ec2_backend.authorize_security_group_egress(*process_rules_from_querystring(self.querystring))
+        return AUTHORIZE_SECURITY_GROUP_EGRESS_RESPONSE
 
     def authorize_security_group_ingress(self):
         self.ec2_backend.authorize_security_group_ingress(*process_rules_from_querystring(self.querystring))
@@ -73,7 +74,10 @@ class SecurityGroups(BaseResponse):
         return template.render(groups=groups)
 
     def revoke_security_group_egress(self):
-        raise NotImplementedError('SecurityGroups.revoke_security_group_egress is not yet implemented')
+        success = self.ec2_backend.revoke_security_group_egress(*process_rules_from_querystring(self.querystring))
+        if not success:
+            return "Could not find a matching egress rule", dict(status=404)
+        return REVOKE_SECURITY_GROUP_EGRESS_RESPONSE
 
     def revoke_security_group_ingress(self):
         self.ec2_backend.revoke_security_group_ingress(*process_rules_from_querystring(self.querystring))
@@ -128,7 +132,31 @@ DESCRIBE_SECURITY_GROUPS_RESPONSE = """<DescribeSecurityGroupsResponse xmlns="ht
                     </item>
                 {% endfor %}
              </ipPermissions>
-             <ipPermissionsEgress/>
+             <ipPermissionsEgress>
+               {% for rule in group.egress_rules %}
+                    <item>
+                       <ipProtocol>{{ rule.ip_protocol }}</ipProtocol>
+                       <fromPort>{{ rule.from_port }}</fromPort>
+                       <toPort>{{ rule.to_port }}</toPort>
+                       <groups>
+                          {% for source_group in rule.source_groups %}
+                              <item>
+                                 <userId>111122223333</userId>
+                                 <groupId>{{ source_group.id }}</groupId>
+                                 <groupName>{{ source_group.name }}</groupName>
+                              </item>
+                          {% endfor %}
+                       </groups>
+                       <ipRanges>
+                          {% for ip_range in rule.ip_ranges %}
+                              <item>
+                                 <cidrIp>{{ ip_range }}</cidrIp>
+                              </item>
+                          {% endfor %}
+                       </ipRanges>
+                    </item>
+               {% endfor %}
+             </ipPermissionsEgress>
              <tagSet>
                {% for tag in group.get_tags() %}
                  <item>
@@ -153,3 +181,14 @@ REVOKE_SECURITY_GROUP_INGRESS_REPONSE = """<RevokeSecurityGroupIngressResponse x
   <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
   <return>true</return>
 </RevokeSecurityGroupIngressResponse>"""
+
+AUTHORIZE_SECURITY_GROUP_EGRESS_RESPONSE = """
+<AuthorizeSecurityGroupEgressResponse xmlns="http://ec2.amazonaws.com/doc/2015-10-01/">
+   <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
+   <return>true</return>
+</AuthorizeSecurityGroupEgressResponse>"""
+
+REVOKE_SECURITY_GROUP_EGRESS_RESPONSE = """<RevokeSecurityGroupEgressResponse xmlns="http://ec2.amazonaws.com/doc/2012-12-01/">
+  <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
+  <return>true</return>
+</RevokeSecurityGroupEgressResponse>"""
diff --git a/tests/test_ec2/test_security_groups.py b/tests/test_ec2/test_security_groups.py
index b39ffac70..a36713d68 100644
--- a/tests/test_ec2/test_security_groups.py
+++ b/tests/test_ec2/test_security_groups.py
@@ -152,6 +152,23 @@ def test_authorize_ip_range_and_revoke():
     security_group = conn.get_all_security_groups()[0]
     security_group.rules.should.have.length_of(0)
 
+    # Test for egress as well
+    egress_security_group = conn.create_security_group('testegress', 'testegress', vpc_id='vpc-3432589')
+    success = conn.authorize_security_group_egress(egress_security_group.id, "tcp", from_port="22", to_port="2222", cidr_ip="123.123.123.123/32")
+    assert success.should.be.true
+    egress_security_group = conn.get_all_security_groups(groupnames='testegress')[0]
+    int(egress_security_group.rules_egress[0].to_port).should.equal(2222)
+    egress_security_group.rules_egress[0].grants[0].cidr_ip.should.equal("123.123.123.123/32")
+
+    # Wrong Cidr should throw error
+    egress_security_group.revoke.when.called_with(ip_protocol="tcp", from_port="22", to_port="2222", cidr_ip="123.123.123.122/32").should.throw(EC2ResponseError)
+
+    # Actually revoke
+    conn.revoke_security_group_egress(egress_security_group.id, "tcp", from_port="22", to_port="2222", cidr_ip="123.123.123.123/32")
+
+    egress_security_group = conn.get_all_security_groups()[0]
+    egress_security_group.rules_egress.should.have.length_of(0)
+
 
 @mock_ec2
 def test_authorize_other_group_and_revoke():