Lambton East was a federal electoral district represented in the House of Commons of Canada from 1882 to 1935.

The East Riding of the county of Lambton was initially defined to consist of the townships of Enniskillen, Brooke, Warwick and Bosanquet, the town of Petrolia, and the villages of Oil Springs, Alvinston, Watford, Arkona and Thedford.

In 1914, it was expanded to include the townships of Zone and Camden in the county of Kent.

The electoral district was abolished in 1933 when it was redistributed between Lambton West and Lambton—Kent ridings.

This riding has elected the following members of Parliament: On Mr. Simmons' death, 11 November 1903: