Last names starting with "O"
- Class of 1976 Maureen O'connell
- Class of 2009 T. O'Connor
- Class of 1974 Katherine Obrien
- Class of 1974 Katie OBrien
- Class of 1970 Stephen Obrien
- Class of 2001 Mike Oconnell
- Class of 1961 Donna OGrady
- Class of 1949 Aldes Olafson
- Class of 1997 Jennifer Oleary
- Class of 1977 Karen Olender (now Zurcher)
- Class of 1971 Debbie Oliver
- Class of 1963 Jerry Oliver
- Class of 1966 Marjorie Oliver
- Mary Olmstead
- Class of 1965 Lee Oplinger
- Class of 1985 Melissa OseiBonsu
- Luke Ostrom
- Class of 1978 Jeanette Owens (formerly Aumick)
- Class of 1976 Paula Oyer
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