Hardin High School is a public high school serving students grades 9–12 located in the city of Hardin, Big Horn County, Montana, United States.

As part of the Hardin High School District, it is attended by students residing within the city of Hardin and unincorporated communities in Big Horn County, including Crow Agency, Montana, Dunmore, Garryowen, St. Xavier, Fort Smith, Yellowtail, Toluca, Foster, and Corinth.

It participates in Montana High School Association classified as Southeastern A.

[6][7] In 2022, the school received the classification of "Universal Support School" by the Montana Office of Public Instruction.

[8] The Hardin Bulldogs compete in the following sports:[9][10]