| Swansea High School | |
| Motto: | Ensuring Student Performance at the Highest Level |
| Type: | Public, secondary |
| Principal: | Marcia Seawright |
| Teaching Staff: | 49.00 (FTE) |
| Ratio: | 13.94 |
| Enrollment: | 683 (2022–2023)[1] |
| Grades: | 9 - 12 |
| Address: | 500 East First Street |
| City: | Swansea, South Carolina |
| Province: | Lexington County |
| Country: | United States |
| Coordinates: | 33.7365°N -81.0942°W |
| District: | Lexington County Schools Lexington School District 4 |
| Colors: | Purple and gold |
| Mascot: | Tigers |
| Yearbook: | Swansean |
| Newspaper: | Tiger Times |
| Nickname: | Swansea Tigers |
| Rival: | Pelion High School |
Swansea High School in Swansea, South Carolina is a public high school offering education for grades 10–12, serving the surrounding communities of Swansea, Gaston, and parts of Pelion. It derives its name from its location next to Swansea, South Carolina.
The following elementary and middle schools feed into Swansea High School:
Swansea's teams are known as the Tigers. Their main athletic rival is the Pelion High School Panthers.