Maruyama (written: 丸山 or 圓山) is a Japanese surname. Notable people with the surname include:
- Atsushi Maruyama (丸山 敦, born 1976), Japanese professional wrestler
- Atsushi Maruyama (actor) (丸山 敦史, born 1983), Japanese actor
- Gisiro Maruyama (丸山 儀四郎, born 1916), Japanese mathematician
- Joshiro Maruyama (丸山 城志郎, born 1993), Japanese judoka
- Karina Maruyama (丸山 桂里奈, born 1983), Japanese women's footballer
- Kunio Maruyama (丸山 邦雄, born 1903), Japanese adventurer and professor of economics
- Masao Maruyama (Japanese Army officer) (丸山 政男, born 1889), Japanese Army officer
- Masao Maruyama (scholar) (丸山 眞男, born 1914), Japanese scholar
- Masao Maruyama (film producer) (丸山 正雄, born 1941), Japanese film producer
- Magoroh Maruyama (born 1929), Japanese/American business educator
- Paul Maruyama, an American judoka
- Shigemori Maruyama (丸山 繁守, born 1967), Japanese swimmer
- Shigeo Maruyama (丸山 茂雄, born 1941), Japanese record producer
- Shigeo Maruyama (engineer) (丸山 茂夫), Japanese engineer
- Shiro Maruyama (圓山 詩郎, born 1948), Japanese fencer
- Tadahisa Maruyama (丸山 忠久, born 1970), Japanese shogi player
- Takahiko Maruyama (丸山 孝彦, born 1946), Japanese sumo wrestler
- Tadayuki Maruyama (丸山 忠行, born 1942), Japanese boxer
- Takashi Maruyama (丸山 孝, born 1953), Japanese volleyball player
- Toshiaki Maruyama (丸山 寿明, born 1959), Japanese Nordic combined skier
- Yuko Maruyama (丸山 裕子, born 1989), Japanese volleyball player