Oyama, Ōyama or Ohyama may refer to:
- Oyama, Tochigi (), a city in Japan
- Ōyama, Ōita (), a town in Japan
- Oyama, Shizuoka (), a town in Japan
- Ōyama, Toyama, (), a former town in Japan
- Mount Ōyama (Kanagawa) (), a mountain in Japan
- Oyama, British Columbia, a town in Lake Country, British Columbia, Canada
- Oyama (Japanese theatre), male actors who play female roles in kabuki theatre, also known as onnagata
- Oyama (crater), in Mars
- 14922 Ohyama, an inner main-belt asteroid
- Oyama Station, a station in Oyama, Tochigi
- Ōyama Station, stations with that name
- Oyama (Bicycle) A brand of bicycle
People with the surname
- , Japanese footballer
- Anza Ohyama (born 1976), Japanese singer and actress
- Arthur Henrique Ricciardi Oyama, or simply Arthur Henrique (born 1987), Brazilian footballer
- Erica Oyama (born 1981), American television writer
- Harue Oyama McVay (born 1928), American ceramist
- , Japanese conductor and violinist
- Ōyama Iwao (), Japanese field marshal
- , Japanese academic and politician
- Judi Oyama, American skateboarder
- Kana Oyama (born 1984) (), Japanese volleyball player
- , Japanese paleontologist and zoologist
- , Japanese former baseball player
- , Japanese footballer
- , Japanese swimmer
- Luís Oyama (born 1997), Brazilian footballer
- , Japanese handball player
- Mary Oyama Mittwer (1907–1994), American journalist
- Mas Oyama (), Zainichi Korean karate master
- , Japanese businessman
- , Japanese volleyball player
- , Japanese speed skater
- , Japanese footballer
- , Japanese footballer
- Nina Oyama (born 1993), Australian comedian
- , Japanese actress
- , Japanese pastor
- , Japanese singer known professionally as Ruann
- , Japanese karateka
- , Japanese sports shooter
- , Japanese golfer
- , Japanese volleyball player
- Shungo Oyama (), Japanese mixed martial artist
- , Japanese former footballer
- Susan Oyama (born 1943), American psychologist and philosopher
- Oyama Susumu (born 1952), Japanese sumo wrestler
- , first Japanese woman to receive a college degree
- , Japanese former footballer, more well-known as
- , Japanese basketball player
- , Japanese voice actor
- , Japanese voice actor
- , Japanese dentist
- Takashi Ohyama, Japanese dentist
- , Japanese samurai
- , Japanese politician
- Yasuharu Ōyama (), Japanese shogi player
- , Japanese footballer
- , Japanese baseball player
- Zac Oyama (born 1987), a CollegeHumor cast member
Fictional characters
- and , characters from the manga series Mix
- , a character from the manga series Please Go Home, Miss Akutsu!
- and , characters from the manga series Onimai: I'm Now Your Sister!
- , a character from the manga series Shutendoji
- , a character from the manga series Maken-ki!
- , a character from the Space Pirate Captain Harlock series
See also
- Oyama v. California (1948), a United States Supreme Court case
- Mount Daisen (Japanese: 大山), written with the same characters as "Ōyama", but using on'yomi reading
- Koyama (disambiguation) (Japanese: 小山), written with the same characters as the geographical "Oyama", but using an alternative kun'yomi reading