Willie James Mabon (October 24, 1925 – April 19, 1985) was an American R&B singer, songwriter, pianist, and harmonica player. He had two number one hits on the Billboard R&B chart, “I Don’t Know” in 1952 and “I’m Mad” in 1953.

Mabon was born and brought up in the Hollywood district of Memphis, Tennessee. He moved to Chicago in 1942, by which time he had become known as a singer and pianist. He formed a group, the Blues Rockers, and in 1949 began recording for Aristocrat Records and then Chess Records.