Marian Elizabeth Ridgeway (died February 14, 1982) was an American political scientist.
She was a professor of political science at Southern Illinois University Carbondale.
Her research on the politics of American states included studying the implications of interstate compacts for federalism, and a book about the Pick–Sloan Missouri Basin Program that became a classic work in the politics of water conservation and flood prevention in the United States.
In 1955, she published the book The Missouri Basin's Pick-Sloan Plan, which was based on her dissertation research.
[6] She was also involved in leadership roles with the League of Women Voters, the American Association of University Professors, and the American Association of University Women.