diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerContext.cs b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerContext.cs
new file mode 100644
index 000000000..34b2f49ba
--- /dev/null
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerContext.cs
@@ -0,0 +1,29 @@
+namespace Amazon.Lambda.APIGatewayEvents
+{
+    using System.Runtime.Serialization;
+
+    /// <summary>
+    /// An object representing the expected format of an API Gateway custom authorizer response.
+    /// </summary>
+    [DataContract]
+    public class APIGatewayCustomAuthorizerContext
+    {
+        /// <summary>
+        /// Gets or sets the 'stringKey' property.
+        /// </summary>
+        [DataMember(Name = "stringKey", IsRequired = false)]
+        public string StringKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the 'numKey' property.
+        /// </summary>
+        [DataMember(Name = "numKey", IsRequired = false)]
+        public int? NumKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the 'boolKey' property.
+        /// </summary>
+        [DataMember(Name = "boolKey", IsRequired = false)]
+        public bool? BoolKey { get; set; }
+    }
+}
diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerPolicy.cs b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerPolicy.cs
new file mode 100644
index 000000000..33fada3c6
--- /dev/null
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerPolicy.cs
@@ -0,0 +1,41 @@
+namespace Amazon.Lambda.APIGatewayEvents
+{
+    using System.Collections.Generic;
+
+    /// <summary>
+    /// An object representing an IAM policy.
+    /// </summary>
+    public class APIGatewayCustomAuthorizerPolicy
+    {
+        /// <summary>
+        /// Gets or sets the IAM API version.
+        /// </summary>
+        public string Version { get; set; } = "2012-10-17";
+
+        /// <summary>
+        /// Gets or sets a list of IAM policy statements to apply.
+        /// </summary>
+        public List<IAMPolicyStatement> Statement { get; set; } = new List<IAMPolicyStatement>();
+
+        /// <summary>
+        /// A class representing an IAM Policy Statement.
+        /// </summary>
+        public class IAMPolicyStatement
+        {
+            /// <summary>
+            /// Gets or sets the effect the statement has.
+            /// </summary>
+            public string Effect { get; set; } = "Allow";
+
+            /// <summary>
+            /// Gets or sets the action/s the statement has.
+            /// </summary>
+            public HashSet<string> Action { get; set; }
+
+            /// <summary>
+            /// Gets or sets the resources the statement applies to.
+            /// </summary>
+            public HashSet<string> Resource { get; set; }
+        }
+    }
+}
diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerRequest.cs b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerRequest.cs
new file mode 100644
index 000000000..8ced77d1f
--- /dev/null
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerRequest.cs
@@ -0,0 +1,23 @@
+namespace Amazon.Lambda.APIGatewayEvents
+{
+    /// <summary>
+    /// For requests coming in to a custom API Gateway authorizer function.
+    /// </summary>
+    public class APIGatewayCustomAuthorizerRequest
+    {
+        /// <summary>
+        /// Gets or sets the 'type' property.
+        /// </summary>
+        public string Type { get; set; }
+
+        /// <summary>
+        /// Gets or sets the 'authorizationToken' property.
+        /// </summary>
+        public string AuthorizationToken { get; set; }
+
+        /// <summary>
+        /// Gets or sets the 'methodArn' property.
+        /// </summary>
+        public string MethodArn { get; set; }
+    }
+}
diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerResponse.cs b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerResponse.cs
new file mode 100644
index 000000000..51218d842
--- /dev/null
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerResponse.cs
@@ -0,0 +1,29 @@
+namespace Amazon.Lambda.APIGatewayEvents
+{
+    using System.Runtime.Serialization;
+
+    /// <summary>
+    /// An object representing the expected format of an API Gateway authorization response.
+    /// </summary>
+    [DataContract]
+    public class APIGatewayCustomAuthorizerResponse
+    {
+        /// <summary>
+        /// Gets or sets the ID of the principal.
+        /// </summary>
+        [DataMember(Name = "principalId")]
+        public string PrincipalID { get; set; }
+
+        /// <summary>
+        /// Gets or sets the <see cref="APIGatewayCustomAuthorizerPolicy"/> policy document.
+        /// </summary>
+        [DataMember(Name = "policyDocument")]
+        public APIGatewayCustomAuthorizerPolicy PolicyDocument { get; set; } = new APIGatewayCustomAuthorizerPolicy();
+
+        /// <summary>
+        /// Gets or sets the <see cref="APIGatewayCustomAuthorizerContext"/> property.
+        /// </summary>
+        [DataMember(Name = "context")]
+        public APIGatewayCustomAuthorizerContext Context { get; set; }
+    }
+}
diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayProxyRequest.cs b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayProxyRequest.cs
index bdeef1c6b..bf75a2938 100644
--- a/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayProxyRequest.cs
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayProxyRequest.cs
@@ -106,6 +106,10 @@ public class ProxyRequestContext
             /// </summary>
             public string ApiId { get; set; }
 
+            /// <summary>
+            /// The APIGatewayCustomAuthorizerContext containing the custom properties set by a custom authorizer.
+            /// </summary>
+            public APIGatewayCustomAuthorizerContext Authorizer { get; set; }
         }
 
         /// <summary>
diff --git a/Libraries/src/Amazon.Lambda.APIGatewayEvents/project.json b/Libraries/src/Amazon.Lambda.APIGatewayEvents/project.json
index 821db3406..cdb7af4ad 100644
--- a/Libraries/src/Amazon.Lambda.APIGatewayEvents/project.json
+++ b/Libraries/src/Amazon.Lambda.APIGatewayEvents/project.json
@@ -1,4 +1,4 @@
-{
+{
   "name": "Amazon.Lambda.APIGatewayEvents",
   "version": "1.0.1-*",
   "title": "Amazon.Lambda.APIGatewayEvents",
@@ -18,6 +18,7 @@
     "warningsAsErrors": true
   },
   "dependencies": {
+    "System.Collections": "4.0.11",
     "System.Runtime": "4.1.0",
     "System.Runtime.Serialization.Primitives": "4.1.1"
   },
diff --git a/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/TestCallingWebAPI.cs b/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/TestCallingWebAPI.cs
index 6d8b98f4a..9187fd53b 100644
--- a/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/TestCallingWebAPI.cs
+++ b/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/TestCallingWebAPI.cs
@@ -102,5 +102,48 @@ public async Task TestGettingSwaggerDefinition()
             Assert.True(response.Body.Length > 0);
             Assert.Equal("application/json", response.Headers["Content-Type"]);
         }
+
+        [Fact]
+        public void TestGetCustomAuthorizerValue()
+        {
+            var requestStr = File.ReadAllText("values-get-customauthorizer-apigatway-request.json");
+            var request = JsonConvert.DeserializeObject<APIGatewayProxyRequest>(requestStr);
+            Assert.NotNull(request.RequestContext.Authorizer);
+            Assert.NotNull(request.RequestContext.Authorizer.StringKey);
+            Assert.Equal(9, request.RequestContext.Authorizer.NumKey);
+            Assert.True(request.RequestContext.Authorizer.BoolKey);
+        }
+
+        [Fact]
+        public void TestCustomAuthorizerSerialization()
+        {
+            var response = new APIGatewayCustomAuthorizerResponse
+            {
+                PrincipalID = "com.amazon.someuser",
+                Context = new APIGatewayCustomAuthorizerContext
+                {
+                    StringKey = "Hey I'm a string",
+                    BoolKey = true,
+                    NumKey = 9
+                },
+                PolicyDocument = new APIGatewayCustomAuthorizerPolicy
+                {
+                    Statement = new List<APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement>
+                    {
+                        new APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement
+                        {
+                            Effect = "Allow",
+                            Action = new HashSet<string> { "execute-api:Invoke" },
+                            Resource = new HashSet<string> { "arn:aws:execute-api:us-west-2:1234567890:apit123d45/Prod/GET/*" }
+                        }
+                    }
+                }
+            };
+
+            var json = JsonConvert.SerializeObject(response);
+            Assert.NotNull(json);
+            var expected = "{\"principalId\":\"com.amazon.someuser\",\"policyDocument\":{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Action\":[\"execute-api:Invoke\"],\"Resource\":[\"arn:aws:execute-api:us-west-2:1234567890:apit123d45/Prod/GET/*\"]}]},\"context\":{\"stringKey\":\"Hey I'm a string\",\"numKey\":9,\"boolKey\":true}}";
+            Assert.Equal(expected, json);
+        }
     }
 }
diff --git a/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/values-get-customauthorizer-apigatway-request.json b/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/values-get-customauthorizer-apigatway-request.json
new file mode 100644
index 000000000..14295ebcb
--- /dev/null
+++ b/Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/values-get-customauthorizer-apigatway-request.json
@@ -0,0 +1,39 @@
+{
+  "resource": "/{proxy+}",
+  "path": "/api/resourcepath/5",
+  "httpMethod": "GET",
+  "headers": null,
+  "queryStringParameters": null,
+  "pathParameters": {
+    "proxy": "api/values"
+  },
+  "stageVariables": null,
+  "requestContext": {
+    "accountId": "AAAAAAAAAAAA",
+    "resourceId": "5agfss",
+    "stage": "test-invoke-stage",
+    "requestId": "test-invoke-request",
+    "identity": {
+      "cognitoIdentityPoolId": null,
+      "accountId": "AAAAAAAAAAAA",
+      "cognitoIdentityId": null,
+      "caller": "BBBBBBBBBBBB",
+      "apiKey": "test-invoke-api-key",
+      "sourceIp": "test-invoke-source-ip",
+      "cognitoAuthenticationType": null,
+      "cognitoAuthenticationProvider": null,
+      "userArn": "arn:aws:iam::AAAAAAAAAAAA:root",
+      "userAgent": "Apache-HttpClient/4.5.x (Java/1.8.0_102)",
+      "user": "AAAAAAAAAAAA"
+    },
+    "authorizer": {
+      "stringKey": "Hey there I'm a string!",
+      "numKey": 9,
+      "boolKey": true
+    },
+    "resourcePath": "/{proxy+}",
+    "httpMethod": "GET",
+    "apiId": "t2yh6sjnmk"
+  },
+  "body": null
+}
\ No newline at end of file