Takeshi So (宗猛, Sō Takeshi, born January 9, 1953 in Usuki, Ōita) is a retired long-distance runner from Japan, who represented his native country at the 1984 Summer Olympics in Los Angeles, California.

So won the 1976 edition of the Košice Peace Marathon in Czechoslovakia.

In 1984, So represented Japan at the 1984 Summer Olympics in Los Angeles, where he finished just outside the medals in fourth place.

He trained 2016 Olympics marathon runner Satoru Sasaki and runs the marathon program for the Japan Association of Athletics Federations.

This biographical article relating to Japanese athletics is a stub.