Stowmarket is a market town and civil parish in the Mid Suffolk district, in Suffolk, England, on the busy A14 trunk road between Bury St Edmunds to the west and Ipswich to the southeast. The town lies on the Great Eastern Main Line (GEML) between Diss and Needham Market, and lies on the River Gipping, which is joined by its tributary, the River Rat, to the south of the town.

Mid Suffolk is a local government district in Suffolk, England. The district is primarily a rural area, containing just three towns, being Stowmarket, Needham Market and Eye. Its council was based in Needham Market until 2017 when it moved to shared offices with neighbouring Babergh District Council in Ipswich, outside either district. In 2021 it had a population of 103,417.