Shinji Sōmai (相米 慎二, Sōmai Shinji, 13 January 1948 – 9 September 2001) was a Japanese film director. He was born in Morioka, Iwate Prefecture, and was brought up in Hokkaido. Somai began his career in 1975 as an assistant director with Nikkatsu Co., one of Japan's leading film production companies, after he dropped out of Chuo University.

Somai made made his debut as a director in 1980 with The Terrible Couple - an adaptation of a popular boys' manga of the time. The film deals with the trials and tribulations of adolescence, presaging a long thread of Somai works in which young people are called upon to test their capabilities while discovering the unreliable nature of adult society. In Somai's hands, children and teenagers are always treated and presented sympathetically and seriously.