Gosainganj, also spelled Goshainganj or Gosaiganj is a town and nagar panchayat in Lucknow district of Uttar Pradesh, India. It is the seat of a community development block, which is included in the tehsil of Mohanlalganj. As of 2011, its population is 9,649, in 1,685 households. The starting point of the Purvanchal Expressway i.e. Chand Saray village is situated 2.5 km away from Gosainganj.