Cancel multiple SharePoint Workflows using PowerShell

Give this one a shot.

I modified it so that it is done on a specific list on a specific web.

#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 $item.Workflows) {#Cancel Workflows        [Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);      }}$web.Dispose();

Worked just fine for me. Let me know if it works for you.

This script has been wickedly useful to me. I make a modification to allow me to cancel all the workflows in one list or just one workflow and thought I would post it here too:

    #Parameters    param($listToCancel,$WfToCancel)    #Site URL     $web = Get-SPWeb "http://mydomain.com";     $web.AllowUnsafeUpdates = $true;         #List Name     $list = $web.Lists[$listToCancel];     #Add wildcards to Wf variable    $WildcardWfToCancel = "*"+$WfToCancel+"*";    # Iterate through all Items in List and all Workflows on Items.              foreach ($item in $list.Items) {     foreach ($wf in $item.Workflows) {     #Test for workflow complete and match criteria    if (($wf.ParentAssociation.InternalName -like $WildcardWfToCancel) -and ($wf.IsCompleted  -ne $true))        {    #Show status and cancel Workflows    write-Host $wf.ItemName -nonewline;    write-host "     " -nonewline;    write-host $wf.ParentAssociation.InternalName;    Write-Host " Status " -nonewline;    Write-host $wf.InternalState;         [Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);           }    }     }     $web.Dispose(); 

Try this (simple "translation" of C# to powershell):

$site = Get-SPSite "<your url>";$site.AllWebs | foreach {  $web = $_;  $web.AllowUnsafeUpdates = $true;  # stop list workflows  $web.Lists | foreach {    $list = $_;    $list.Items | foreach {      $item = $_;      $item.Workflows | foreach {         $wf = $_;         [Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);      }    }  }  # stop site workflows  $web.Workflows | foreach {    $wf = $_;    [Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);  }      $web.AllowUnsafeUpdates = $false;  $web.Dispose();}$site.Dispose();