Last names starting with "O"
- Class of 1967 Roberta O'Neal (now Marshall)
- Class of 1974 Mary Oberg
- Class of 1969 John Obriant
- Class of 1961 Catherine Obrien
- Class of 1983 Cathleen Obrien
- Class of 2015 Max Odell
- Harry Oldach
- Jacqueline Oliva
- Class of 2009 Ashley Oliveira
- Class of 1993 Robert Oliveira
- Class of 1976 Sandra Olmstead
- Class of 1998 Rich Orlowski
- Class of 1979 Janet Orse
- Class of 2007 Tatiana Ospina
- Class of 1983 Annette Oullette
- David Owen
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About the South Windsor High School Alumni Directory
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