South Fremont High School, Public high school in St. Anthony, Idaho, United States.

South Fremont High School is a public school building in St. Anthony that educates students from grades 9 through 12. The facility includes modern rooms for classroom instruction, physical education, and extracurricular programs.

South Fremont High School is one of two high schools in the Fremont Joint School District #215, alongside North Fremont High School in Ashton. In 1992 the ACLU objected to a nativity scene with two-inch figures arranged in a school hallway by the student council, calling it a breach of the First Amendment. In 1998 graduation ceremonies held at Ricks College, run by the Church of Jesus Christ of Latter-day Saints, drew criticism from a school board member.

The school colors are red and black, and the mascot is a cougar; teams compete in IHSAA Class 3A in the Mountain Rivers Conference, where Sugar-Salem High School is the rival. In 1992 the student council arranged a nativity scene with two-inch figures in a school hallway, which drew ACLU criticism over the First Amendment.

The school building is located in the center of St. Anthony and is easily reached by local roads. Keep in mind that the campus is active on school days and parking space can be limited.

South Fremont's wrestling team won state titles in 1985, 2020, 2021, 2022 and 2023, the first in class A-2 (now 3A). The sport was introduced at the school in 1958. The team competes in the Mountain Rivers Conference against rivals such as Sugar-Salem and Teton.