Located in the Roman Catholic Archdiocese of Chicago, it was founded in 1918 by members of the Sinsinawa Dominican Sisters.

[2] Trinity is officially affiliated with the International Baccalaureate Organization in Geneva, Switzerland, the premier global honors program.

All students are required to take speech, health, keyboarding, computer applications, business, fine arts, and theology classes before graduating.

Trinity has a well-developed fine arts curriculum, including classes in singing, acting, drawing, painting, and other styles of artistic expression.

These sports include basketball, bowling, cross country, golf, soccer, lacrosse, softball, swimming, tennis, track, volleyball, and ice hockey.

Many student-athletes who attended Trinity High School have continued their education and athletic careers at D1, D2, and D3 universities.