Yoshiko Sato

is a retired Japanese freestyle swimmer who won seven gold medals at the Asian Games in 1958–1962. She competed at the 1956 and 1960 Olympics in five sprint events in total with the best result of seventh place in the 4×100 m medley relay.

Nationally Sato won four consecutive titles in the 100 m (1958–1961) and seven consecutive titles in the 200 m (1955–1961). From 1954 to 1962 she set 97 national records in freestyle events ranging from 50 to 1500 m, which remains an all-time record on its own.