Fort Branch Marlette High School, commonly known as Fort Branch High School, was a public high school located in Fort Branch, Indiana.

Like the current Fort Branch Community School, Fort Branch High School's mascot was the Twigs, and the school colors were black and gold.

Fort Branch was part of the Pocket Athletic Conference shortly before the merging.

[1] The building was then used as the Fort Branch Middle School (grades 6–8) until 1982, when the current Fort Branch Community School building was completed.

The original Fort Branch High School gymnasium continues to be used for community functions.