Last names starting with "O"
- Class of 1968 Cheryl O Sullivan
- Class of 1965 James O'connell
- Class of 1974 Alan O'neil
- Class of 1956 Sheila O'Neill
- Class of 1968 Cheryl O'Sullivan-Conley Memorial
- Class of 1984 Millicent Obain
- Class of 1970 Janice OBrien
- Class of 1981 Lisa Obryon
- Kenji Okuno
- Class of 1973 Janet Olson
- Class of 1975 Elizabeth Ommerle
- Class of 1965 Binky Oneil
- Class of 1992 Naoko Onishi
- Class of 1980 Robin Opuszenski (formerly Farrell)
- Class of 1967 Leslie Orloff (formerly Corkran)
- Class of 1955 Ann Osborn
- Class of 1978 Robert Ottenstein
- Class of 1961 Judy Overton Jones
- Class of 1961 Diane Owens
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About the Darien High School Alumni Directory
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