Last names starting with "O"
- Class of 2009 Maureen O'Malley
- Class of 1984 Charles Oberman
- Class of 1976 Stephen Obermeier
- Class of 1981 Cheryl Obrien
- Class of 1978 Tim Oconnor
- Enrique Oda
- Class of 1973 Sue Odem
- Class of 1993 Sharon Odonnell
- Class of 1985 Joanne ODonoghue
- Class of 2008 John Oese
- Class of 1984 Bibi Olsen
- Class of 1981 Dana Olsen
- Class of 1973 Gail Olsen
- Class of 1978 Nancy Olsen
- Class of 2011 Harold Ordonez
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