Last names starting with "O"
- Class of 1970 Brian O'Sullivan
- Class of 1988 Kelly Oates
- Class of 2013 Adriana Ochoa
- Class of 1992 Chris Oconnor
- Class of 1995 Vincent Odom
- Class of 2013 Sarat Odufuye
- Class of 1969 Brian Ogrady
- Laura Oliff
- Class of 1970 Esther Orlando (formerly Fisher)
- Class of 1981 Tim Orr (formerly Hahn)
- Patricia Ortega
- Class of 1993 Rhonda Ortega
- Class of 2007 Zajir Ortiz
- Class of 1983 Robert Osborne, Jr
- Class of 1978 Frank Ostella
- Class of 1970 Sterling Osterhoudt
- Class of 1986 Jeannine Ott (now Penn)
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