Last names starting with "O"
- Class of 1979 Michael O'Brien (now OBrien)
- Sharon Odgen
- Class of 1981 Paua Odom
- Class of 1981 Paula Odom (formerly Wnuk)
- Class of 1990 Christine Olbrycht
- Ted Olbrycht
- Class of 1992 Liza Olivera (now Hayes)
- Class of 1973 Jean Openshaw
- Class of 1965 Robert Opiela
- Class of 1974 Michael Orapello
- Class of 1991 Lana Orlup
- Class of 1988 Robert Orsini
- Class of 1994 David Ortega
- Class of 2014 Alen Ortiz
- Class of 1998 Alexander Ortiz
- Class of 2014 Dianalopez Osoria
- Class of 1974 Sherri Ott
- Ariel Ovalle
- Class of 1970 Debra Overbaugh
- Ronald Overliese
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