Bülach District (Bezirk Bülach) is one of 12 districts of the Canton of Zürich in Switzerland, with some 117,000 inhabitants the third largest in the canton. Its administrative capital is Bülach, the largest municipality is Kloten, the location of Zurich Airport. It includes the Rafzerfeld north of the Rhine, with Rafz, Wil, Hüntwangen and Wasterkingen.