Arima (written: 有馬) is a Japanese surname. Notable people with the surname include:
Akito Arima (born 1930), Japanese nuclear physicist
Arima Yoriyuki (1714–1783), Japanese mathematician
Haruo Arima, Japanese former football player
Ineko Arima (born 1932), Japanese actress
Kaoru Arima (1893–1956), admiral and commander in the Imperial Japanese Navy
Katsuaki Arima (born 1969), Japanese voice actor
Keitarō Arima (born 1969), Japanese manga artist
Kenji Arima (born 1972), retired Japanese footballer
Ko Arima (born 1917), Japanese football player
Masafumi Arima (1895–1944), admiral in the Imperial Japanese Navy
Stafford Arima, Canadian-born theatre director
Toshio Arima (born 1942), President and Representative Director of the Fuji Xerox company
Yoriyasu Arima (1884–1957), Japanese politician
Yoshinaga Arima (born 1993), Japanese footballer
Fictional characters:
Soichiro Arima, the male protagonist in the anime and manga series Kare Kano
Kishou Arima, a character from the anime series Tokyo Ghoul
Kousei Arima, a character from the anime series Your Lie in April
