William J. Brennan High School
| William J. Brennan High School | |
|---|---|
| Location | |
2400 Cottonwood Way , , 78253 | |
| Coordinates | 29°27′29″N 98°43′30″W / 29.458°N 98.725°W |
| Information | |
| School type | Public, high school |
| Motto | "Brennan Fight Never Dies" |
| Founded | 2010 |
| Locale | Suburb: Large |
| School district | Northside ISD |
| NCES School ID | 483312012347 |
| Principal | John Trimble |
| Faculty | 174.28 (on an FTE basis) |
| Grades | 9–12 |
| Enrollment | 2,965 (2024–2025) |
| Student to teacher ratio | 17.01 |
| Colors | Black and gold |
| Athletics conference | UIL AAAAAA |
| Mascot | Bears |
| Feeder schools | Dr. Joe J. Bernal MS Gregory Luna MS |
| Sports District | 28-6A |
| Website | Official website |
William J. Brennan High School is the tenth public high school in the Northside Independent School District of San Antonio, Texas, United States. It is a four-year high school that opened in 2010 and graduated its first senior class in June 2012. During 2024–2025, Brennan High School had an enrollment of 2,965 students and a student to teacher ratio of 17.01. For the 2024–2025 school year, the school was given a "C" by the Texas Education Agency, with a distinction for Academic Achievement in English/Language Arts/Reading.