Boris Dmitriyevich Grishin (Russian: Борис Дмитриевич Гришин, born 4 January 1938 in Moscow) is a Russian water polo player who competed for the Soviet Union in the 1964 and the 1968 Summer Olympics. He is married to champion Olympic fencer Valentina Rastvorova. His daughter, Yelena Grishina, is also an Olympic fencer. Sergey Bida, Yelena's son and Boris's grandson, is a world champion fencer. Later he was a water polo coach. His son Yevgeny was also a successful water polo player.