Luther Martin Kennett (March 15, 1807 – April 12, 1873) was a U.S. Representative from Missouri and mayor of the City of St. Louis.

Born in Falmouth, Kentucky, Kennett attended private schools.

Kennett then spent several years in Europe on account of ill health before returning to St. Louis in 1849.

After losing his re-election, he retired to his home near St. Louis Missouri.

He later moved to Europe in 1867 where he remained until his death in Paris, France, on April 12, 1873.