Louise Overacker (November 18, 1891—April 26, 1982) was an American political scientist. She specialized in the study of money in politics, United States presidential primaries, and comparative party systems, particularly those of Australia, New Zealand, and the United Kingdom. She was one of the first professors to teach government at Wellesley College, where she was a faculty member from 1925 until 1957, and helped to establish the Wellesley Department of Political Science in 1940.