Brazilian submarine Bahia (S12)

Bahia (S12) may refer to one of the following submarines of the Brazilian Navy:


 * Brazilian submarine Bahia (S12) (Balao class), the former American Balao-class submarine USS Plaice (SS-390); in Brazilian Navy service, 1963–1972; dismantled in 1973
 * Brazilian submarine Bahia (S12) (Tench class), the former American Tench-class submarine USS Grampus (SS-523); in Brazilian Navy service, 1972–1978; scrapped in 1981