Eiji Morioka (森岡 栄治, June 8, 1946 – November 12, 2004) was a Japanese amateur boxer. He is best known for winning a bronze medal at the 1968 Summer Olympics in Mexico City, competing in the bantamweight division (–54 kg).
Born in Tokyo, Morioka developed a strong reputation as an amateur boxer in Japan. His career culminated in his participation in the 1968 Mexico City Olympics. In the bantamweight competition, Morioka advanced through the early rounds, securing his place in the semifinals. He ultimately lost his semifinal bout, but as per boxing rules at the time, both losing semifinalists were awarded bronze medals. This achievement marked him as one of Japan's notable Olympic medalists in boxing.
After his amateur boxing career, Morioka reportedly transitioned into coaching, contributing to the development of future generations of Japanese boxers. He passed away in 2004 at the age of 58.