Satoko Tanaka (田中 聡子, Tanaka Satoko, born February 3, 1942) is a retired Japanese backstroke swimmer. She competed at the 1960 and 1964 Olympics in the 100 m backstroke and 4×100 m medley relay. She won individual bronze in 1960 and finished fourth in both events in 1964. Between 1959 and 1964 she set 10 world records in the 200 m backstroke, but did not have a chance to compete in this discipline. She set five more world records in the 110 yd and 220 yd backstroke. Tanaka held the national records in the 100 m and 200 m backstroke for 12 years. In retirement for many decades she worked as a swimming coach, and also competed in the masters category. In 1991 she was inducted into the International Swimming Hall of Fame.