Last names starting with "O"
- Class of 1962 Dennis O'leary
- Class of 1970 Colleen Obrein
- Class of 1993 Jennifer Obremski
- Class of 1970 Coleen Odell
- Class of 1982 Mark Oksinski
- Class of 2002 Josh Oliver
- Class of 1997 Dedi Olsen
- Class of 2008 Matthew Olsen
- Class of 1997 Dede Olson
- Terrence Oneil
- Class of 1972 Kathy Oprysko
- Class of 1973 Larry Osborne
- Class of 1971 Patricia Osborne (now Moore)
- Casey Ostrander
- Class of 2006 Danieal Ostrander
- Class of 1985 Michelle Overacker
- Class of 1966 Wendy Overacker
- Ray Overdurf
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