Democratic Party members of the United States House of Representatives from Wisconsin

Thomas David Patrick O'Malley Sr. (March 24, 1903 – December 19, 1979) was an American Democratic politician from Milwaukee, Wisconsin. He served three terms in the United States House of Representatives, representing Wisconsin's 5th congressional district from 1933 through 1939, and was later an appointee in the United States Department of Labor. His father, Thomas J. O'Malley, was the 26th lieutenant governor of Wisconsin.

Gerald Daniel Kleczka (; November 26, 1943 – October 8, 2017) was an American politician and Democratic member of the United States House of Representatives from 1984 to 2005, representing Wisconsin's 4th congressional district. The district included the city of Milwaukee.