National Honor Society
The National Honor Society recognizes superior scholarship, outstanding service, leadership and character. Students must have a minimum cumulative GPA of 3.4 at the end of sophomore or junior year to be eligible for selection to the National Honor Society. The selection of members to the chapter shall be by a majority vote of the faculty council consisting of five faculty members appointed annually by the principal. Induction to the NHS takes place in the fall. Members of the NHS wear a distinguishing stole at graduation exercises and receive diplomas indicating NHS membership. Any member of NHS who fails to live up to the prescribed standards will be asked to resign. Possible reasons for removal from NHS include cheating, plagiarism and/or other serious disciplinary issues.

Student Council
The Mercy High School Student Activities Council has been established to maintain school spirit, create unity among the classes, encourage good relations between the administration and the student body, instill good citizenship, and sponsor student activities including mixers, food drives, Walk-a-Thon, Father/Daughter Dance, Mother/Daughter Mass and Brunch, and Spirit Week. It represents the entire student body and provides the means for student expression.

Peer Ministry
Peer Ministry is a yearlong experience designed to build Christian leadership skills and enhance personal and spiritual awareness in its members, in the context of Mercy High School's overall ministry program. It is a program that requires strict participation and commitment.

Peer Ministers must be freely committed individuals willing to become part of a team with the common goal of actively witnessing Christian leadership to their peers.

The purpose of this program is to provide Mercy with a team of spiritual leaders able to minister in the areas of liturgy, prayer, liturgical services, retreats, and in all other areas of spiritual need at Mercy. Peer Ministers are expected to be of service in their own parishes and outside the Mercy community.