Mark Edward Souder was an American politician and businessman from Indiana. A Republican, he was a U.S. Representative from 1995 to 2010.

Indiana's 3rd congressional district is a congressional district in the U.S. state of Indiana. Based in Fort Wayne, the district takes in the northeastern part of the state. This district includes all of Adams, Allen, Blackford, DeKalb, Huntington, LaGrange, Noble, Steuben, Wells and Whitley counties, as well as northern Jay and northeast Kosciusko counties.