Last names starting with "O"
- Class of 1953 Bert O Neill
- Class of 1995 Neil OConnell
- Class of 1989 Pamela Odriscoll
- Class of 1972 Walter OHaver
- Class of 2013 Nisha Oikuarie
- Class of 1996 Lisa Oldenburg
- Class of 1971 Fred Olson
- Class of 1977 Victoria Grace Olszewski
- Class of 1981 John ONeal
- Class of 1972 Lois Oquist
- Class of 1971 Patrick Oremus
- Class of 1970 Chris Osberg
- Class of 1970 Chris Osterberg
- Class of 2015 Abby Ostrovsky
- Class of 2013 Samantha Ostrowski
- Class of 1980 Jennifer Ott
- Class of 1961 Henry Ottmann
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