Barbara Lynn (born Barbara Lynn Ozen, later Barbara Lynn Cumby, January 16, 1942) 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 was born in Beaumont, Texas, and attended Hebert High School. She was raised Catholic and sang in the choir at her local parish. She also played piano as a child, but switched to guitar, which she plays left-handed. Inspired by blues artists Guitar Slim and Jimmy Reed, and pop acts Elvis Presley and Brenda Lee, and winning several local talent shows, she created an all-female band, Bobbie Lynn and Her Idols.

She began performing in local clubs in Texas. Singer Joe Barry saw her and introduced Lynn to producer Huey P. Meaux, who ran SugarHill Recording Studios and several record labels in New Orleans. Her first single, “You’ll Lose A Good Thing”, written by her, was recorded at Cosimo Matassa‘s J&M 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.