Sunao Ishiharada (石原田 愿, Ishiharada Sunao, March 24, 1915 – 1987) was a Japanese freestyle swimmer who competed in the 1932 Summer Olympics and in the 1936 Summer Olympics.
He was born in Kagoshima Prefecture.
In 1932 he was eliminated in the semi-finals of the 1500 metre freestyle event.
Four years later he finished fourth in the 1500 metre freestyle competition.
This Japanese swimming biography is a stub.