Akito Arima, KBE (有馬 朗人, Arima Akito, 13 September 1930 – 7 December 2020) was a Japanese nuclear physicist, politician, and haiku poet, known for the interacting boson model.

Arima became a lecturer in 1960, and an associate professor at the Department of Physics in 1964 at the University of Tokyo.

In 1998 he entered the Diet of Japan as a member of the House of Councillors for the Liberal Democratic Party.

Arima has served as the Chancellor of Musashi Academy of the Nezu Foundation since 2006.

[9] He was posthumously promoted to the court rank of Senior Third Rank (shosanmi or ōkimi no tsunokurai), which is usually awarded to high-ranking politicians and prominent scholars in post-war Japan.