Last names starting with "O"
- Class of 1970 Sue Obliness
- Class of 1973 Polly ODonnell (formerly Pearson)
- Class of 1948 Bruce Lee Oliver
- Class of 1974 Mark Oliver
- Class of 2003 John Olsen
- Class of 1994 Julie Olson
- Class of 1955 Malcome Olyer
- Class of 1951 Ernisten Onbe
- Class of 1951 Ernisten Onbe Onbe
- Class of 1995 Michael Onco
- Class of 1985 Jack Orr
- Class of 1990 Robert Ortiz
- Class of 2014 Cheyenne Owen
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About the El Reno High School Alumni Directory
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