Isaac P. Walker

Isaac Pigeon Walker (November 2, 1815March 29, 1872) was an American lawyer, Democratic politician, and Wisconsin pioneer. He was one of Wisconsin's first , serving from 1848 through 1855. In the Senate, he was best known for his support of radical land reform; much of what he proposed was enacted as the Homestead Act of 1862 after he left office.

His political career, however, was prematurely ended by the complicated politics of pre-Civil War slavery compromises—Walker was always personally opposed to slavery, but endorsed a compromise on handling the Mexican Cession which was anathema to his anti-slavery Wisconsin electorate. Before Wisconsin statehood, he served in the House of Representatives of the Wisconsin Territory, and was speaker for one session during the 5th Wisconsin Territorial Assembly.

Before coming to Wisconsin, he also served one term in the Illinois House of Representatives. Isaac P. Walker was a younger brother of George H. Walker, one of the founders of Milwaukee, Wisconsin, and Milwaukee's 5th mayor.