| Ryōhei Koiso | |
| Birth Date: | 25 July 1903 |
| Birth Place: | Kobe, Kobe City, Hyogo Prefecture |
| Death Place: | Higashinada-ku, Kobe |
| Nationality: | Japanese |
| Occupation: | Painter |
| Education: | Tokyo University of the Arts |
| Native Name: | 小磯良平 |
| Native Name Lang: | ja |
| Awards: |
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(July 25, 1903 – December 16, 1988) was a Japanese artist. He graduated from the Tokyo University of the Arts western art department in 1927 and had a successful career from early on. During World War II he was often commissioned paintings depicting Japanese military scenes, such as the signing of the British surrender of Singapore, and Japanese infantrymen making their way through high grass fields in Malaysia. He returned to mainstream painting following the war, and painted until his death. His work was also part of the painting event in the art competition at the 1936 Summer Olympics.[1]