Gilbert Marquis LaFayette Johnson (November 4, 1837 – January 9, 1871) was an officer in the Union Army from Indiana during the American Civil War, reaching the rank of colonel. In 1866, he was nominated and confirmed for appointment to the grade of brevet brigadier general. After the war, Johnson returned to Huntsville, Alabama, and married the daughter of a prominent Huntsville citizen. He served as the town's postmaster from 1869 until his death in 1871 of complications from his war wounds. He was buried in Maple Hill Cemetery in Huntsville.