Thomas E. Mann (born September 10, 1944) is the W. Averell Harriman Chair and a senior fellow in Governance Studies at the Brookings Institution, a non-partisan think tank based in Washington, D.C. He primarily studies and speaks on U.S. elections, campaign finance reform, Senate and filibuster reform, Congress, redistricting, and political polarization. Mann is a fellow of the American Academy of Arts and Sciences and a member of the Council on Foreign Relations. He is a recipient of the American Political Science Association’s Frank J. Goodnow and Charles E. Merriam Awards.