| Motto: | Cardinal Spirit Never Dies |
| Established: | 1913 |
| Principal: | Erfain Amaya |
| Faculty: | 136.16 (FTE) |
| Ratio: | 14.26 |
| Enrollment: | 1,942 (2022-2023)[1] |
| Athletics: | Football, marching band, basketball, volleyball, tennis, baseball, softball, track, power-lifting, swimming, soccer, cheer, dance, cross country, golf |
| Conference: | District 32-6A |
| Colors: | Red & white & black |
| Mascot: | Cardinal |
| Rivals: | San Benito High School, Harlingen High School South |
| Campus Type: | Closed campus |
| Free Label: | Mascot Nickname |
| Free Text: | Big Red and Lady Red |
| Address: | 1201 Marshall Avenue |
| City: | Harlingen |
| Zipcode: | 78550 |
| Country: | United States |
| Coordinates: | 26.2074°N -97.6836°W |
Harlingen High School is a public high school located in Harlingen, Texas, United States. It is part of the Harlingen Consolidated Independent School District and was the first of five HCISD high schools established. HHS was the sole high school from its establishment in 1913 to 1993 when the school split and Harlingen High School South was formed. For the 2021-2022 school year, the school was given a "B" by the Texas Education Agency.[2]
The Cardinals are known for their successful football, dance and band programs. The football program has the second most wins of any school south of San Antonio and also has the most playoff appearances of any valley school. The Cardinal football program holds 37 district championships, the most in South Texas. The Harlingen Cardinals compete in the following sports:[3]