Bilsi is a town and municipal board situated in the Badaun district of Uttar Pradesh, India. It is located to the southwest of Bareilly and serves as its own tehsil. The sub-district code for the Bilsi block is 00780.
The total area of Bilsi covers 361 km2, which consists of 332.13 km2 of rural area and 28.60 km2 of urban area. According to the 2011 Census, the population of the region is 404,198 people residing in approximately 67,758 houses across about 204 villages.