Lemuel Charles "Lem" Johnson (August 6, 1909 – April 1, 1989) was an American jazz saxophonist who played both tenor and soprano saxophones.
Early in the 1930s he played in the band of Grant Moore (1931–35) in the Milwaukee, Wisconsin area, and then worked with Eli Rice and Earl Hines.
In 1937 he moved to New York, where he played with Fess Williams, Luis Russell and Louis Jordan, and joined Skeets Tolbert's band in 1939.
In Tolbert's group Johnson sang in addition to playing sax.
He recorded with Buster Harding, Eddie Durham, Edgar Hayes, Sidney Bechet, Claude Hopkins, St. Louis Jimmy Oden, Sam "The Man" Taylor and Sammy Price, and also cut some sessions as a leader, which have subsequently been released on compact disc.