Last names starting with "O"
- Dave Oberhauser
- Class of 2003 Vanessa Obmann
- Class of 1998 Benjamin Ochoa
- Class of 1993 John Ochoa
- Class of 1996 Alyssa Oconnell
- Class of 2010 Michael Oesterling
- Class of 2009 Jessica Olguin
- Class of 1995 Alison Olson (now Pollakoff)
- Class of 1965 Angie Oneal
- Class of 2015 Alexis Orona
- Class of 2000 Laura Orozo
- Class of 2004 Luis Ortega
- Class of 1998 Richard Ortega
- Class of 2013 Adriana Ortiz
- Class of 2017 Brandon Ortiz
- Class of 2006 Vanessa Ortiz
- Class of 1998 Melissa Orwig
- Class of 1966 Claudia Osborne
- Class of 2006 Alvina Osbourne
- Danielle Oxuart
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About the Rancho Cucamonga High School Alumni Directory
Check out all of the names of the Rancho Cucamonga High School alumni that attended high school in Rancho Cucamonga that are listed above. Registering will allow you to join the directory. If you are an alumn of Rancho Cucamonga High you should register now in the alumni directory. We also encourage you to interact with the rest of the alumni on this site. You can find old friends, share photos and stay updated on the latest school news.