The St. Louis Alumni Association (SLAA) was incorporated 99 years ago on June 27, 1907, during the tenure of Brother Bertram Bellinghausen, St. Louis' first president. James L. Holt was the first president of SLAA, which began with 200 charter members. 

SLAA is devoted to supporting; assisting, and improving St. Louis School. The Alumni Association serves as goodwill ambassadors for the school and actively assists, promotes, and publicizes the policies, objectives, undertakings, and projects of St. Louis School. The SLAA provides financial assistance for worthy students attending St. Louis School, and gives special consideration to students who are sons of fellow alumni. The SLAA promotes and participates in the civic, industrial, recreational, and educational activities of the St. Louis School community, and the broader community in which the school and its students exist. 

The SLAA offers continued moral, spiritual, intellectual, and social improvements to its members, and provides assistance in times of distress, sickness, or death. The SLAA is proud of its distinction of being the only Hawaii High School Alumni with its own clubhouse facility for the use and enjoyment of its members and their families. 

We are proud that St. Louis has produced informed, responsible men for this community and for the world. This pride is the result of an experience of a sound education that was offered in a secure community unified with Catholic philosophies. 

Today over 2,500 alumni are participating members of the SLAA and is governed by a nine-member Board of Directors. We have various standing committees that are responsible for implementing the wishes of the Board. Board meetings are held on the third Wednesday of each month and all active members are invited to attend these meetings.