diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/workflow/workflow-instance.delete.desc.xml b/config/alfresco/templates/webscripts/org/alfresco/repository/workflow/workflow-instance.delete.desc.xml
new file mode 100644
index 0000000000..ea38626642
--- /dev/null
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/workflow/workflow-instance.delete.desc.xml
@@ -0,0 +1,8 @@
+<webscript>
+   <shortname>Delete Workflow Instance</shortname>
+   <description>Either cancels or deletes the specified workflow instance.</description>
+   <url>/api/workflow-instances/{workflow_instance_id}?forced={forced?}</url>
+   <format default="json"/>
+   <authentication>user</authentication>
+   <transaction>required</transaction>
+</webscript>
\ No newline at end of file
diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/workflow/workflow-instance.delete.json.ftl b/config/alfresco/templates/webscripts/org/alfresco/repository/workflow/workflow-instance.delete.json.ftl
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/config/alfresco/web-scripts-application-context.xml b/config/alfresco/web-scripts-application-context.xml
index 349c7d13f6..feb3a3b18a 100644
--- a/config/alfresco/web-scripts-application-context.xml
+++ b/config/alfresco/web-scripts-application-context.xml
@@ -821,6 +821,11 @@
           class="org.alfresco.repo.web.scripts.workflow.WorkflowInstancesGet"
           parent="abstractWorkflowWebScript"></bean>
 
+    <!-- Either cancels or deletes the specified workflow instance. -->
+    <bean id="webscript.org.alfresco.repository.workflow.workflow-instance.delete"
+          class="org.alfresco.repo.web.scripts.workflow.WorkflowInstanceDelete"
+          parent="abstractWorkflowWebScript"></bean>
+
     <!--                                   -->
     <!--      Audit Service REST API    -->
     <!--                                   -->
diff --git a/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowInstanceDelete.java b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowInstanceDelete.java
new file mode 100644
index 0000000000..8c41c84d02
--- /dev/null
+++ b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowInstanceDelete.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.repo.web.scripts.workflow;
+
+import java.util.Map;
+
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.extensions.webscripts.Cache;
+import org.springframework.extensions.webscripts.Status;
+import org.springframework.extensions.webscripts.WebScriptRequest;
+
+/**
+ * @author unknown
+ * @since 3.4
+ *
+ */
+public class WorkflowInstanceDelete extends AbstractWorkflowWebscript
+{
+
+    public static final String PARAM_FORCED = "forced";
+    
+    @Override
+    protected Map<String, Object> buildModel(WorkflowModelBuilder modelBuilder, WebScriptRequest req, Status status, Cache cache)
+    {
+        Map<String, String> params = req.getServiceMatch().getTemplateVars();
+
+        // getting workflow instance id from request parameters
+        String workflowInstanceId = params.get("workflow_instance_id");
+
+        boolean forced = getForced(req);
+        
+        if (forced)
+        {
+            workflowService.deleteWorkflow(workflowInstanceId);
+        }
+        else
+        {
+            workflowService.cancelWorkflow(workflowInstanceId);
+        }
+        
+        status.setCode(HttpServletResponse.SC_NO_CONTENT);
+        return null;
+    }
+    
+    private boolean getForced(WebScriptRequest req)
+    {
+        String forced = req.getParameter(PARAM_FORCED);
+        if (forced != null)
+        {
+            try
+            {
+                return Boolean.valueOf(forced);
+            }
+            catch (Exception e)
+            {
+                // do nothing, false will be returned
+            }
+        }
+
+        // Defaults to false.
+        return false;
+    }
+}
diff --git a/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowRestApiTest.java b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowRestApiTest.java
index 7636edd47c..759efa5946 100644
--- a/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowRestApiTest.java
+++ b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowRestApiTest.java
@@ -53,6 +53,7 @@ import org.springframework.extensions.surf.util.ISO8601DateFormat;
 import org.springframework.extensions.webscripts.Status;
 import org.springframework.extensions.webscripts.TestWebScriptServer.GetRequest;
 import org.springframework.extensions.webscripts.TestWebScriptServer.PutRequest;
+import org.springframework.extensions.webscripts.TestWebScriptServer.DeleteRequest;
 import org.springframework.extensions.webscripts.TestWebScriptServer.Response;
 
 /**
@@ -487,6 +488,31 @@ public class WorkflowRestApiTest extends BaseWebScriptTest
         assertTrue(stateFilteredResult.length() > 1);
     }
     
+    public void testWorkflowInstanceDelete() throws Exception
+    {
+        //Start workflow as USER1 and assign task to USER2.
+        personManager.setUser(USER1);
+        WorkflowDefinition adhocDef = workflowService.getDefinitionByName("jbpm$wf:adhoc");
+        Map<QName, Serializable> params = new HashMap<QName, Serializable>();
+        params.put(WorkflowModel.ASSOC_ASSIGNEE, personManager.get(USER2));
+        Date dueDate = new Date();
+        params.put(WorkflowModel.PROP_DUE_DATE, dueDate);
+        params.put(WorkflowModel.PROP_PRIORITY, 1);
+        params.put(WorkflowModel.ASSOC_PACKAGE, packageRef);
+        params.put(WorkflowModel.PROP_CONTEXT, packageRef);
+
+        WorkflowPath adhocPath = workflowService.startWorkflow(adhocDef.getId(), params);
+        WorkflowTask startTask = workflowService.getTasksForWorkflowPath(adhocPath.getId()).get(0);
+        startTask = workflowService.endTask(startTask.getId(), null);
+
+        WorkflowInstance adhocInstance = startTask.getPath().getInstance();
+
+        Response response = sendRequest(new DeleteRequest(URL_WORKFLOW_INSTANCES + "/" + adhocInstance.getId()), 204);
+        assertEquals(Status.STATUS_NO_CONTENT, response.getStatus());
+        
+        assertNull(workflowService.getWorkflowById(adhocInstance.getId()));
+    }
+
     @Override
     protected void setUp() throws Exception
     {