Morgan Lewis Martin (March 31, 1805 – December 10, 1887) was an American lawyer, land speculator, Democratic politician, and one of Wisconsin's founding fathers.

In May 1827, Martin moved to what is now Green Bay, Wisconsin,[1][2] on the advice of his cousin, James Duane Doty, to practice law.

He formed a partnership with Solomon Juneau and owned much of the land that later became Milwaukee, but sold his share in 1836.

Martin was elected on the Democratic Party ticket as a non-voting member to represent the Wisconsin Territory in the Twenty-ninth Congress, with 6,803 votes to 5,787 for Whig James Collins and 790 for Edward D. Holton of the Liberty Party.

Martin was a candidate for Governor at the 1848 Wisconsin Democratic Party Convention prior to the state's first gubernatorial election.