Morgan County is a county located in the central portion of the U.S. state of Missouri. As of the 2020 census, the population was 21,006. Its county seat is Versailles. The county was organized January 5, 1833, and named for General Daniel Morgan of the American Revolutionary War.

Daniel Morgan was an American pioneer, soldier, and politician from Virginia. One of the most respected battlefield tacticians of the American Revolutionary War of 1775–1783, he later commanded troops during the suppression of the Whiskey Rebellion of 1791–1794.