| Century High School | |
| Motto: | Once a Centurion, always a Centurion. |
| Established: | 1932 |
| Type: | Public |
| Principal: | Landon Sommer |
| Head Name: | Second Master |
| Head Name2: | Assistant Headmaster |
| Enrollment: | 207 (2016-17)[1] |
| Grades: | 6-12 |
| Streetaddress: | 4721 Shawnee College Rd. |
| City: | Ullin |
| State: | Illinois |
| Country: | United States |
| District: | Century Community Unit School District 100 |
| Nickname: | Centurions |
| Free Label: | Emblem |
| Website: | CHS |
Century High School is located in Ullin, Illinois.It Combines the small towns of Karnak, Illinois, New Grand Chain, Illinois, Ullin, Illinois, Perks, Illinois, and Wetaug, Illinois into one school in Pulaski county. Pulaski County, Illinois.