Sidney Lanier High School is a local public high school of the San Antonio Independent School District in the westside of San Antonio, Texas and classified as a 5A school by the University Interscholastic League. During 2022–2023, Lanier High School had an enrollment of 1,547 students and a student to teacher ratio of 96.92. The school received an overall rating of "C" from the Texas Education Agency for the 2021–2022 school year.