Last names starting with "O"
- Class of 1997 Melissa Okon
- Class of 1979 Janice Oliveira
- Class of 1979 Lynn Olmstead
- Class of 1976 Terry Ann Olsen
- Class of 1966 Jeff Olson
- Linda Oneil
- Class of 1963 Elayne Orfield
- Class of 1966 Michael Orielly
- Class of 1971 Debbie Orr
- Class of 1978 Lori Orsechowski
- Class of 1976 Joe Orzechowski
- Class of 1964 Joan Osden
- Class of 1991 Pamela Ostrich
- Class of 1996 Jennifer Ouellette
- Class of 1994 Patrick Ouellette
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