Last names starting with "O"
- Janet Obie
- Mathew Obrien
- Jared Oldroyd
- Class of 1997 Alder Oliva (formerly Silveira)
- Class of 1957 Rita Oliver
- Class of 1992 Matt Olsen
- Class of 1988 Debbi Olson
- Class of 1988 Harla Olson (now Olson-Torres)
- Class of 1994 John Olson
- Class of 1969 Sharon OMeara (formerly Kelly)
- Class of 2016 Shane Orme
- Class of 1989 Tammy Orr
- Class of 2000 Johnnie Osborn
- Class of 1995 Gene Overton
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About the Elmira High School Alumni Directory
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