Last names starting with "O"
- Class of 1981 Maryann O Brien
- Class of 1977 William O'Connor
- Class of 1973 Barbara Oconnor
- Fredric OConnor
- Rick OConnor
- Class of 1974 Pattey Oliver
- Class of 1974 Diana Oliverio
- June Ollom
- Class of 2005 McKenzie Oo
- Karen Oross
- Class of 1948 Lois Oshell
- Class of 1991 Sean Ostreicher
- Class of 1987 Cathy Ostrowski
- Class of 1996 Lida Ostrowski
- Class of 1981 Terry Otoole
- Class of 1984 Renee Outlaw
- Class of 1990 Linda Overhue
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