The mission of the Castlemont High School Alumni Association (CHSAA) is:

• To promote fellowship among Castlemont High School (CHS) alumni;
• To highlight the legacy of Castlemont High School alumni and continue the legacy with each graduating class;
• To initiate, encourage, and conduct activities to benefit CHS; and
• To affect positive changes in the lives of students currently attending CHS, recent graduates, and former students.