diff --git a/src/models/entities/GroupContact.ts b/src/models/entities/GroupContact.ts
index f650259..bc624dd 100644
--- a/src/models/entities/GroupContact.ts
+++ b/src/models/entities/GroupContact.ts
@@ -9,6 +9,7 @@ import {
 } from "class-validator";
 import { Column, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn } from "typeorm";
 import { config } from '../../config';
+import { ResponseGroupContact } from '../responses/ResponseGroupContact';
 import { Address } from "./Address";
 import { IAddressUser } from './IAddressUser';
 import { RunnerGroup } from "./RunnerGroup";
@@ -85,7 +86,7 @@ export class GroupContact implements IAddressUser {
   /**
    * Turns this entity into it's response class.
    */
-  public toResponse() {
-    return new Error("NotImplemented");
+  public toResponse(): ResponseGroupContact {
+    return new ResponseGroupContact(this);
   }
 }
\ No newline at end of file
diff --git a/src/models/responses/ResponseGroupContact.ts b/src/models/responses/ResponseGroupContact.ts
new file mode 100644
index 0000000..f7e63b3
--- /dev/null
+++ b/src/models/responses/ResponseGroupContact.ts
@@ -0,0 +1,67 @@
+import { IsInt, IsString } from "class-validator";
+import { GroupContact } from '../entities/GroupContact';
+import { ResponseRunnerGroup } from './ResponseRunnerGroup';
+
+/**
+ * Defines the group contact response.
+*/
+export class ResponseGroupContact {
+    /**
+     * The contact's id.
+     */
+    @IsInt()
+    id: number;
+
+    /**
+     * The contact's first name.
+     */
+    @IsString()
+    firstname: string;
+
+    /**
+     * The contact's middle name.
+     */
+    @IsString()
+    middlename?: string;
+
+    /**
+     * The contact's last name.
+     */
+    @IsString()
+    lastname: string;
+
+    /**
+     * The contact's phone number.
+     */
+    @IsString()
+    phone?: string;
+
+    /**
+     * The contact's e-mail address.
+     */
+    @IsString()
+    email?: string;
+
+    /**
+     * The contact's associated runner groups.
+     */
+    groups: ResponseRunnerGroup[];
+
+    //TODO: Address
+
+    /**
+     * Creates a ResponseGroupContact object from a contact.
+     * @param contact The contact the response shall be build for.
+     */
+    public constructor(contact: GroupContact) {
+        this.id = contact.id;
+        this.firstname = contact.firstname;
+        this.middlename = contact.middlename;
+        this.lastname = contact.lastname;
+        this.phone = contact.phone;
+        this.email = contact.email;
+        for (let group of contact.groups) {
+            this.groups.push(group.toResponse());
+        }
+    }
+}