Wilhelmina Maria "Willy" Lust (later Postma, born 19 June 1932) is a retired Dutch track-and-field athlete. She won a silver medal in the long jump at the 1950 European Athletics Championships. Two years later she competed at the 1952 Summer Olympics, in the 80 m hurdles, long jump and 4×100 m relay; she finished in fifth place in the long jump and in sixth place in the relay. She was also successful in the pentathlon, holding national records and winning two national titles in 1950 and 1951.