| Westerville South High School | |
| Streetaddress: | 303 South Otterbein Avenue |
| City: | Westerville |
| State: | Ohio |
| County: | (Franklin County) |
| Zipcode: | 43081 |
| Country: | USA |
| Coordinates: | 40.1178°N -82.9225°W |
| District: | Westerville City Schools |
| Superintendent: | Angela Hamberg[1] |
| Principal: | Mike Hinze |
| Teaching Staff: | 91.20 (FTE) |
| Ceeb: | 365430 |
| National Ranking: | 3,291[2] |
| Avg Class Size: | 20 |
| Ratio: | 16.58 |
| Type: | Public high school |
| Grades: | 9-12 |
| Conference: | Ohio Capital Conference |
| Fightsong: | Stand Up And Cheer |
| Team Name: | Wildcats[3] |
| Established: | 1960 |
| Enrollment: | 1,512 (2022–23)[4] |
| Homepage: | School Website |
Westerville South High School is a public high school located in Westerville, Ohio, northeast of Columbus, Ohio. Originally Westerville High School, it is the oldest of the three high schools in the Westerville City School District. 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. The school mascot is the Wildcat. Its CEEB code is 365430.