Peterborough East was a federal electoral district represented in the House of Commons of Canada from 1867 to 1925.

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

In 1882, it was defined to consist of the townships of Asphodel, Belmont, Methuen, Douro, Dummer, Burleigh, Anstruther, Chandos, Dysart, Dudley, Harcourt, Guilford, Harburn, Bruton, Havelock, Eyre, Clyde, Nightingale, Livingstone, Lawrence, Cavendish, Glamorgan, Cardiff, Monmouth, Otonabee and Harvey, and the villages of Ashburnham, Lakefield and Norwood.

In 1903, it was redefined to consist of the townships of Anstruther, Asphodel, Belmont, Burleigh, Chandos, Douro, Dummer, Methuen and Otonabee, and the villages of Havelock, Lakefield and Norwood.

In 1914, it was redefined of the townships of Anstruther, Asphodel, Belmont, Burleigh, Chandos, Douro, Dummer, Methuen and Otonabee, and the villages of Havelock, Lakefield and Norwood.