Last names starting with "O"
- Class of 1982 Kevin O'Neill
- Class of 1992 Stephanie Obondo
- Class of 1967 Kristine Obrien
- Class of 1981 Mary Jane Obrien
- Wes Obring
- Class of 1974 Les Oja
- Class of 1970 Margie Oleyar
- Class of 1993 Kris Olsen
- Class of 1993 Amy Olson
- Class of 1983 Miya Omori
- Class of 1976 John Oneill
- Class of 1982 Kevin Oneill
- Steven Ori
- Class of 1999 Andrew Orlando
- Class of 1989 Francine Ortega
- Class of 1985 Silvia Ortiz
- Class of 1981 Kim Owen
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