| DeKalb County High School | |
| Streetaddress: | 1130 W. Broad Street |
| City: | Smithville |
| State: | Tennessee |
| County: | DeKalb |
| Zipcode: | 37166 |
| Country: | United States |
| Schooltype: | Public secondary |
| Established: | 1963 |
| District: | DeKalb County Schools |
| Superintendent: | Patrick Cripps |
| Principal: | Bruce Curtis |
| Principal Label: | Principal |
| Grades: | 9–12 |
| Enrollment: | 814 (2023–24)[1] |
| Avg Class Size: | 20–30 |
| Language: | English |
| Hours In Day: | 7 |
| Colors: | Black and old gold [2] |
| Slogan: | Tiger Pride |
| Sports: | Football, Baseball, Softball, Basketball, Soccer, Tennis, Golf, Cross Country |
| Mascot: | Tiger |
| Team Name: | DeKalb County Fighting Tigers |
| Rival: | Livingston Academy, Cannon County High School, Smith County High School, Upperman High School |
| Yearbook: | The Tiger |
| Communities: | Smithville, Dowelltown, Liberty, Alexandria, Temperance Hall |
| Affiliations: | Tennessee Secondary School Athletic Association |
DeKalb County High School (DCHS) is located in Smithville, Tennessee. It is the only high school in the county and serves grades 9–12 with an enrollment of 814 as of August 10, 2023.[1] The school's mascot is a tiger and the school colors are black and gold. The principal is Bruce Curtis and the assistant principals are Thomas Cagle and Jenny Norris.[3] The school is fed by DeKalb Middle School (6–8; located at the same complex as the high school) and DeKalb West School (K-8).[4]
DCHS has a variety of clubs, including FFA, FBLA, FCCLA, HOSA, Jr. and Sr. Beta Club, SkillsUSA, CTE, a Chess Club, a Literature Club, a Science Club, and a Spanish Club. Other groups include the Student Council as well as a Color Guard and Marching Band known as the "Fighting Tiger Marching Band".[3]