Shigeru So (宗 茂, Sō Shigeru) (born 9 January 1953 in Usuki, Ōita) is a Japanese retired long-distance runner who represented his native country at two Summer Olympics: 1976 and 1984.
He won the 1985 edition of the Tokyo Marathon.
His twin brother Takeshi So is also a retired Olympic marathoner, and finished fourth in Los Angeles, California (1984).
Some road racing authorities consider his winning run at the Beppu-Ōita Marathon in 1978 (2:09:05.6) to have been a marathon world best.
This biographical article relating to Japanese athletics is a stub.