Peterborough West was a federal electoral district represented in the House of Commons of Canada from 1867 to 1953.

It was created by the British North America Act of 1867 which divided the County of Peterborough was into two ridings.

In 1903, the townships of Cavendish, Galway, Harvey, and the village of Ashburnham were added to the riding.

In 1924, Peterborough West was defined to consist of the part of the county of Peterborough included in the townships of Galway, Cavendish, Harvey, Ennismore, Smith, Douro, Otanabee and North Monaghan, and that part of the county of Northumberland included in the township of South Monaghan, together with the city of Peterborough.

This riding elected the following members of the House of Commons of Canada: