John Charles McAdams (October 26, 1945 – April 15, 2021) was an American associate professor of political science at Marquette University. McAdams taught courses on American politics and public policy, voter behavior, and the John F. Kennedy assassination; he ran a website on the assassination and has published a book on the subject, JFK Assassination Logic: How to Think about Claims of Conspiracy (2011). He described himself as "a debunker by temperament". McAdams was suspended by Marquette in 2014 for publicly criticizing a graduate student. McAdams filed suit for breach of contract and in 2018 the Wisconsin Supreme Court ordered the university to reinstate him.