Lucius Lyon (February 26, 1800 – September 24, 1851) was a U.S. statesman from the state of Michigan. Along with Louis Campau, Lucius Lyon is remembered as one of the founding fathers of Grand Rapids, Michigan, the state's second-largest city. A Democrat, he served as a Delegate to the U.S. House from Michigan Territory (1833-1835), a U.S. Senator from Michigan (1837-1839), and a member of the U.S. House of Representatives from Michigan's second congressional district (1843-1845).