The Harlan Society, named in honor of the first Justice Harlan of the Supreme Court of the United States, is the honorary academic society of the Law School. The purpose of the Harlan Society is to recognize graduating students who, through consistently outstanding academic achievement, have excelled in preparing themselves for their role in the legal profession. Each year, the Society elects its members from among the students who are graduating in the top 10 percent of their class. In addition to its social and fund-raising events, the Association participates in regional and national conferences. The HLSA also hosts an internal moot court competition from which students are selected to represent St. Mary's in the Hispanic National Bar Association's Moot Court Competition.
Membership is open to all students regardless of ethnic background.
The International Law Association seeks to promote interest and research in international and comparative law. The Association hosts guest speakers who discuss current political and economic issues facing the world and sponsors an annual trip and professional exchange with Mexican law students of Saltillo. The Jewish Law Students Association was formed in 1991 to provide a support group for Jewish students, to focus on important issues in the Jewish legal community and to support and promote the values of St. Mary's University. Membership in the Jewish Law Students Association is open to all students of the St. Mary's University Law School community. The Law Student Division of the San Antonio Bar Association seeks to offer students exposure to the local bar and its activities.