Last names starting with "O"
- Class of 1975 Belinda O'Bannon (now OBannon)
- Class of 1966 Donald O'Hagan
- Class of 1973 Michael O'Pallick
- Class of 1976 Ernie Ochoa
- Class of 1966 Barbara Ohliger
- Class of 1968 Richard Okuda
- Dennis Oleary
- Class of 1979 Michael Olson
- Class of 1974 Jack Orme
- Class of 1965 Tom Ormsby
- Class of 1978 Lawrence Ortega
- Class of 1977 Caroline Ortiz
- Class of 1978 Caroloyn Ortiz
- John Otoole
- Class of 1967 Pat OToole
- Class of 1969 Ramona Ovies
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