Last names starting with "O"
- Class of 1983 Cassie Lynn OBrien (formerly Scalf)
- Erin Odowd
- Class of 1974 Gregory Olivas
- Class of 1993 Maria Olivas
- Class of 1988 Scott Omsted
- David Oops
- Class of 1967 Gene Orbach
- Dan Oreilly
- Class of 2002 Gabriel Ortiz
- Class of 1990 Stacy Ortiz (formerly Day)
- Class of 1997 Jonathan Orvis
- Class of 1984 Idella Osborn
- Class of 1974 Tiani Osborn
- Class of 1990 Scott Ostrem
- Class of 1997 Damien Overholser
- Class of 1997 Damien Overhoser
- Class of 1966 Sandra Overhultz
- Andrew Owens
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