Four people were hospitalized yesterday after being blasted with pepper spray during a fight in a Bronx high school.

Suspect Steve Reeves, 18, and three faculty members from Millenium Arts Academy on Lafayette Avenue in Castle Hill suffered minor respiratory ailments following the 11:10 a.m. incident, authorities said.

Reeves was fighting a 16-year-old classmate in the first floor hallway just outside the principal’s office when a faculty member intervened, sources said.

Unable to break up the brawling boys, the faculty member summoned a cop assigned to the School Safety Task Force, sources added.

The cop tried to restrain Reeves, but the teen struggled with the officer, the sources said.

The officer used his pepper spray to subdue Reeves, sources added.