This DSA hosts data release 4 of the UKIRT Infrared Deep Sky Survey housed at the Wide Field Astronomy Unit at the Univeristy of Edinburgh. This catalog contains WFCAM data primarily originating from four of the five UKIDSS surveys: Large Area Survey, Galactic Clusters Survey, Deep Extragalactic Survey and the Ultra Deep Survey. The data for the Galactic Plane Survey will not be available until April 22, 2010. (see www.ukidss.org for survey descriptions)