Westerville South High School is a public high school located in Westerville, Ohio, northeast of Columbus, Ohio.

It serves most of southern Westerville, as well as much of the portion of Columbus served by Westerville City Schools.

Dedicated in 1960 as Westerville High School, it was renamed Westerville South High School in 1975 upon the opening of Westerville's second high school, Westerville North.

The principal of Westerville South is Mike Hinze.

School colors are red and white.