Selby District was a local government district of North Yorkshire, England, from 1974 to 2023. Its council was based in the town of Selby. The district had a population of 83,449 at the 2011 Census. The southernmost district of North Yorkshire, it bordered the City of York unitary authority, the Borough of Harrogate in North Yorkshire, the City of Leeds and City of Wakefield districts in West Yorkshire, the City of Doncaster in South Yorkshire, and the ceremonial county of the East Riding of Yorkshire.

Selby is a market town and civil parish in North Yorkshire, England; it is located 12 miles (19.3 km) south of York on the River Ouse. In the 2021 UK Census, it had a population recorded at 19,760.