Last names starting with "O"
- Class of 1983 Margaret Obenauf
- Class of 1985 Colleen Obrien
- Class of 1976 Sean Obrien
- Class of 1979 Charles Oconnor
- Class of 1975 Erin OConnor
- Class of 1980 Mark Oconnor
- Class of 1975 Barbara Od
- Class of 1975 Erin ODonnell
- Terrence Odonnell
- Nancy Ogrinc
- Class of 1970 Gloria Omalley
- Class of 1968 John Orourke
- Class of 1997 Greg Ostrolencki
- Class of 1994 Dennis Osullivan
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