Last names starting with "O"
- Class of 1986 Duncan Oklahoma
- Class of 1967 John Oloughlin
- Class of 1971 Pam Oneal
- Class of 1961 Phil Oneal
- Class of 1967 Shirley Oneal
- Tom Osborne
- Class of 2006 Nicholas Owen
- Class of 1966 Sandra Owen,s
- Class of 1976 Marvin Owens
- Class of 1966 Sandra Owens
- Class of 1966 Sandra Owens (formerly Morrow)
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About the Duncan High School Alumni Directory
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