Last names starting with "O"
Unknown Grad Year
- Class of 1945 Charles O'Bryan
- Class of 1966 Nancy Obrien
- Class of 1959 Marian Oconell
- Patrick Oconnell
- Class of 1975 Holly Ohillips
- Class of 1985 Jesse Olivarez
- Class of 1974 Katherine Oliver
- Class of 1973 Heather Olsen
- Class of 2012 Cody Olson
- Class of 1982 Jenny Openshaw
- Class of 1996 Camillia Oropeza
- Class of 1968 Janice Oroville Union High (now Griffin)
- Class of 1995 Steve Osborne
- Class of 1977 Rick Osbourn
- Sherry Ott (formerly Ravert)
- Class of 1959 Bennie Owen (formerly Brackeen)
- Class of 1925 Stanley Owen
- Donna Owens
- Class of 1964 Leslie Owens
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