Budaun (bədounˈ) [key], city (1991 pop. 116,695), Uttar Pradesh state, N India, on the Sot River. An administrative center, it trades in grain, cotton, sugarcane, and oilseed. It was an important military outpost under the Mughals. The Great Mosque (the Jama Masjid), which dates from 1223, is in Budaun.