Ochiai (written: 落合) is a Japanese surname. Notable people with the surname include:
Hidy Ochiai (落合 秀彦, born 1939), Japanese judoka, karateka and writerHiromitsu Ochiai (落合 博満, born 1953), Japanese baseball player and managerHiroshi Ochiai (落合 弘, born 1946), Japanese footballerMasayuki Ochiai (落合 正幸), Japanese film directorOchiai Michihisa (落合 道久), Japanese samuraiMotoki Ochiai (落合 モトキ, born 1990), Japanese actorOchiai Naobumi (落合 直文, 1861-1903), pseudonym of Ayukai Morimitsu, Japanese poetRumi Ochiai (落合 るみ, born 1973), Japanese voice actress