Ochiai (written: ) is a Japanese surname. Notable people with the surname include:
- , Japanese voice actor
- , Japanese judoka, karateka and writer
- , Japanese baseball player and manager
- , Japanese footballer
- Kentaro Ochiai, Japanese diplomat at Paris Peace Conference (1919–1920)
- , Japanese film director
- , Japanese samurai
- , Japanese actor
- , pseudonym of Ayukai Morimitsu, Japanese poet
- Nobuhiko Ochiai (落合 信彦; 1942–2026), Japanese journalist and novelist
- , Japanese sport shooter
- , Japanese voice actress
- , Japanese basketball player
- , Japanese sumo wrestler competing under the name Hakunofuji
- , is a Japanese academic and media artist
See also
- Ochiai, Okayama, a former town in Maniwa District, Okayama Prefecture, Japan
- Ochiai Station (disambiguation), multiple railway stations in Japan