I am not sure if there is anything in the API but if you want access to the core and you have programming permission you can get it by following the instructions here: http://platform.xwiki.org/xwiki/bin/view/DevGuide/Scripting#HXWikiCoreAccess Once you have the core XWiki object and the XWikiContext you can get the group service by calling def coreGroupService = wiki.getGroupService(xc) (this is also possible in velocity if you have programming right.) Caleb Radek Rekas wrote: