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 writer
Hiromitsu Ochiai (落合 博満, born 1953), Japanese baseball player and manager
Hiroshi Ochiai (落合 弘, born 1946), Japanese footballer
Masayuki Ochiai (落合 正幸), Japanese film director
Ochiai Michihisa (落合 道久), Japanese samurai
Motoki Ochiai (落合 モトキ, born 1990), Japanese actor
Ochiai Naobumi (落合 直文, 1861-1903), pseudonym of Ayukai Morimitsu, Japanese poet
Rumi Ochiai (落合 るみ, born 1973), Japanese voice actress
