Maurice Morton Milligan (November 23, 1884 – June 19, 1959), a U.S. Attorney for the Western District of Missouri, is most famous for the successful 1939 prosecution of the Kansas City boss Tom Pendergast.

Milligan and Missouri Governor Lloyd C. Stark split the anti-Pendergast vote in the Democratic primary and so Truman won.

Milligan's case against Pendergast centered on a $750,000 insurance payoff scam and a failure to pay federal income taxes from 1927 to 1937.

Pendergast ultimately pleaded guilty to two charges of income tax evasion and was fined $10,000 and sentenced to 15 months in federal prison.

In 1948, Milligan wrote a book about his exploits: Missouri Waltz, The Inside Story of the Pendergast Machine by the Man Who Smashed It (ISBN 1-299-19592-X).