Joel Moses Gabb (21 November 1882 – 6 March 1951) was an Australian politician. Born in Adelaide, South Australia, he was educated there at Prince Alfred College before becoming a church worker and greengrocer. In 1919, he was elected to the Australian House of Representatives as the Labor member for Angas, defeating long-serving Nationalist member Paddy Glynn. Gabb was defeated by Nationalist candidate Walter Parsons in 1925, but defeated Parsons in 1929 to regain the seat.