Sometimes I needed to cancel all workflow on a specific list. The following powershell script will help you to do this. #Site URL $web = Get-SPWeb "http://urlforsite.com"; $web.AllowUnsafeUpdates = $true; #List Name $list = $web.Lists["ListName"]; # Iterate through all Items in List and all Workflows on Items.         foreach ($item in $list.Items) { foreach ($wf in $item.Workflows) { #Cancel Workflows        oMicrosoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);      } } $web.Dispose();