Brien McMahon High School (BMHS) is a secondary school located in Norwalk, Connecticut, United States. It is named after Brien McMahon, a former United States Senator from Norwalk. The school's mascot is a Senator and its colors are red, white, and blue. The school's first senior class graduated in 1962.

The Center for Global Studies is a magnet school within Brien McMahon High School. This is a magnet program for students in Fairfield County who want to learn Arabic, Chinese, or Japanese languages, and the respective culture and history. A Middle Eastern Studies program was introduced in the fall of 2006.

The diversity break down of the school is 60% Hispanic, 22% White, 13% Black, 3% Asian, and 2% other.