Malcolm B. Wiseman (born May 23, 1925), better known as Mac Wiseman, is an American bluegrass singer, nicknamed The Voice with a Heart. The bearded singer is one of the cult figures of bluegrass.

Born in Crimora, Virginia, he studied at the Shenandoah Conservatory in Dayton, Virginia—before it moved to Winchester, Virginia in 1960—and started his career as a disc jockey at WSVA-AM in Harrisonburg, Virginia.