Last names starting with "O"
- Class of 1984 Linda Obe
- Class of 1962 Frank Oddo
- Class of 1970 Martin Ojeda
- Class of 2003 Raul Olivares
- Class of 1968 Judith Olmedo
- Class of 1968 Judy Olmedo
- Class of 2019 Maka Omar
- Class of 1973 Lawrence Orebeaux Iii
- Class of 1962 Angela Orlowski
- Class of 1962 Angela Ralph Orlowski
- Class of 1989 Irma Ortix
- Class of 1981 Dennis Ortiz
- Class of 2003 Heriberto Ortiz
- Class of 2000 Joleen Ortiz
- Class of 1983 Victoria Ortiz
- Class of 1999 Vilma Ortiz
- Class of 2005 Juan Carlos Ortiz Millian
- Class of 2006 Joel Osorio
- Class of 1959 Gail Ostrow
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