Last names starting with "O"
- Class of 2009 Tashina Marie O
- Class of 1983 Michael O'Hanisain
- Class of 2001 Todd Oconnell
- Class of 1971 Candace Odell (formerly Bidwell)
- Class of 1956 Carl Odell
- Class of 1969 Christopher Odoherty
- Class of 2000 Nicholas Oldford
- Class of 2006 Cassara Olligschlager
- Class of 1968 Juli Olrich
- Class of 1976 Kim Omel
- Class of 1987 Stephen Orlowski
- Damon Orvelo
- Class of 2002 Jeremiah Orvis
- Class of 1980 Matk Ostrowski
- Class of 1994 Jesse Otteman
- Class of 1980 Alan Otto
- Class of 1973 Michael Oxford
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