RCAF Station Aylmer was a Royal Canadian Air Force airfield that was built between late 1940 and June 1941 northeast of Aylmer, Ontario. It was one of many built across Canada under the British Commonwealth Air Training Plan during World War II.

Aylmer is a town in Elgin County in southern Ontario, Canada, just north of Lake Erie, on Catfish Creek. It is 20 kilometres (12 mi) south of Highway 401, and is almost equidistant between the United States cities of Detroit and Buffalo.