Willisau District is one of the five districts (German: Ämter), of the German-speaking Canton of Lucerne, Switzerland. Its capital is the town of Willisau. It has a population of 51,009 (as of 31 December 2013). In 2013 the name was changed from Amt Willisau to Wahlkreis Willisau as part of a reorganization of the Canton.