South Fremont High School is a four-year public secondary school in St. Anthony, Idaho, United States.^[3] It is one of two high schools in the Fremont School District #215. The school colors are red and black and the mascot is a cougar. They are classified as a 3A school. The school excels in many programs, including athletics and music.^[4]

In 1992, the school caught the attention of the American Civil Liberties Union for displaying a nativity scene in a school hallway. The scene contained two-inch tall figures which were arranged by the school's student council. The ACLU argued that the display was a violation of the First Amendment to the United States Constitution, which guarantees separation of church and state.^[5]

The school also received criticism in 1998 for holding its graduation ceremonies at Ricks College, which is run by the Church of Jesus Christ of Latter-day Saints. A school board member claimed that the ceremony would be uncomfortable for students who were not Mormons.^[6] The ACLU had fought with the school district in the 1980s to move its high school graduation from a LDS church building to a public school.^[5]

South Fremont competes in athletics in IHSAA Class 3A, and is a member of the Mountain Rivers Conference. Other schools in this conference include rival Sugar-Salem High School and Teton High School.

The school’s sports teams include football, volleyball, soccer, basketball, wrestling, baseball, softball, speed golf, and track and field.

• Jason Buck, former NFL defensive lineman for Cincinnati Bengals and Washington Redskins, first-round 17th overall pick in 1987 NFL Draft by Cincinnati Bengals, winner of Outland Trophy in 1986 at BYU.^[8]
• Brandon Bair, defensive lineman for the Oregon Ducks, Kansas City Chiefs, Oakland Raiders, and Philadelphia Eagles.
• Gregory W. Moeller, American lawyer and judge, who is an associate justice of the Idaho Supreme Court.