Michael Kieran Reilly (July 15, 1869 – October 14, 1944) was an Irish American lawyer and Democratic politician from Fond du Lac, Wisconsin. He served six full terms and one partial term in the U.S. House of Representatives, representing Wisconsin's 6th congressional district from 1913 to 1917, and from December 1930 to January 1939. Earlier in his career, he served as district attorney of Fond du Lac County and city attorney of Fond du Lac.
