Southside High School is a 5A public high school in the Southside Independent School District of San Antonio, Texas (United States).

Southside High School serves the far south side of the city of San Antonio.

For the 2021-2022 school year, the school was given a "B" by the Texas Education Agency.

[2] The Southside Cardinals compete in the following sports:[3] The golf team has won consecutive district titles.

[citation needed] The Southside marching band, also known as the Mighty Cardinal Band, has around 100 members.