Archbishop Carroll is an active chapter of the Tri-M Honor Society, which is committed to music education and advocacy. Tri-M recognizes those who excel musically and academically, using their talents to serve others. New members are formally inducted during a ceremony in the spring. Tri-M students must remain in good academic standing and participate in music-related service projects throughout the year.
New and current members must have an average of 90 or above in each class, with at least a 93 in their music class. Students are also required to participate in an extracurricular ensemble and complete one year of a music class prior to joining Tri-M.