Barbara Lynn (born Barbara Lynn Ozen, later Barbara Lynn Cumby, January 16, 1942 Beaumont, TX) is an American rhythm and blues and electric blues guitarist, singer and songwriter. She is best known for her R&B chart-topping hit, “You’ll Lose a Good Thing” (1962). In 2018, Lynn received a National Heritage Fellowship.

She began performing in local clubs in Texas. Singer Joe Barry saw her and introduced Lynn to producer Huey P. Meaux, who ran several record labels in New Orleans. Her first single, “You’ll Lose a Good Thing“, for which she was the songwriter, was recorded at Cosimo Matassa‘s J&M Recording Studio with session musicians including Mac Rebennack (Dr. John). Released by Jamie Records, it was a number 1 US Billboard R&B chart hit and Top 10 Billboard Hot 100 hit in 1962. The song was later recorded by Aretha Franklin and became a country hit record for Freddy Fender.