Lambton West was a federal electoral district represented in the House of Commons of Canada from 1883 to 1968.

The West Riding of the county of Lambton was initially defined to consist of the townships of Sarnia, Moore and Plympton, the town of Sarnia, and the villages of Wyoming, Forest and Point Edward.

In 1903, the riding was redefined to include the townships of Dawn and Sombra, and exclude the town of Forest.

In 1966, the electoral district was abolished when it was redistributed between Middlesex and Sarnia ridings.

This riding elected the following members of the House of Commons of Canada: On Mr. Lister being appointed judge, 21 June 1898: On Mr. Johnston's death, 4 July 1905: