Zofingen District is a district in the Swiss canton of Aargau. It is located in the southwest corner of the Canton. The seat is Zofingen. The largest municipality in population is Oftringen, the smallest is Wiliberg. It has a population of 73,843 (as of 31 December 2020).

Bezirk Zofingen has an area, as of 2009, of 141.97 square kilometers (54.81 sq mi).