Hiroko Yamasaki

is a retired Japanese rhythmic gymnast.

After enrolling at the Tokyo Women's College of Physical Education, Yamasaki became a five-time national champion. She competed for Japan in the individual rhythmic gymnastics all-around competition at the 1984 Olympic Games in Los Angeles. She tied for 9th place in the qualification round and advanced to the final, placing 8th overall. Yamasaki retired the same year.