St. Patrick High School is a Catholic high school located in the south end of Thunder Bay, Ontario.

It is part of the Thunder Bay Catholic District School Board, and its amenities include a chapel, custom-built music rooms, newly renovated auditorium (as of 2010), two gyms, a fully functional cafeteria, and wheelchair accessibility.

The schools offers French Immersion and Advanced Placement programs.

Unlike schools in the public system, students at St. Patrick are required to wear uniforms.

Saint Patrick is one of the two high schools to have uniforms in Thunder Bay.