Northumberland—Durham was a federal electoral district represented in the Canadian House of Commons from 1968 to 1979. It was located in the province of Ontario. This riding was created in 1966 from parts of Durham and Northumberland ridings.
It consisted of the County of Durham, the Townships of Alnwick, Haldimand, Hamilton, South Monaghan and Percy in the County of Northumberland, and the Village of Hastings.
The electoral district was abolished in 1976 when it became part of Durham—Northumberland riding.