Royal Air Force Acaster Malbis, or more simply RAF Acaster Malbis, is a former Royal Air Force station located 5.9 miles (9.5 km) south of York city centre and 5.7 miles (9.2 km) east of Tadcaster, North Yorkshire, England. It was developed from a small grass airfield at the beginning of the Second World War and its main use was as a training base for RAF Bomber Command, before being used by RAF Maintenance Command from 1944 until 1957.