Hirayama (written: 平山) is a Japanese surname. Notable people with this surname include:
Aya Hirayama - an actressHideyuki Hirayama - a film directorIkuo Hirayama - a painterKiyotsugu Hirayama, who discovered the Hirayama families of asteroidsKōji Hirayama - a politicianSatoshi Hirayama - a Japanese-American baseball playerShin Hirayama, the first Japanese astronomer to discover an asteroidSōta Hirayama - an international football (soccer) playerTomonori Hirayama, football playerYu Hirayama - a badminton playerYuji Hirayama - a rock climberHirayama can also refer to:
1999 Hirayama - an asteroidHirayama (crater) - a luner craterHirayama family - a family of asteroidsHirayama Station - a train station in Chiba PrefectureHirayama syndrome - a lower motor neuron disease