Last names starting with "O"
- Class of 2002 Joanna O'Grady
- Class of 1987 Joanne O'Meara
- Class of 1967 Nancy O'Neil
- Class of 1990 Ayanna Obrien
- Class of 1970 Patricia OBrien
- Mary Ocon
- Class of 1959 Cornelius OConnell
- Class of 1961 Sheila Oconnell
- Class of 1939 Charles Oconnor
- Class of 1972 Paul Oldham
- Class of 1968 Rosemarie Oliveri
- Class of 1978 Victor Olmeda
- Class of 1925 Dorothy Olsen
- Class of 1954 Ronald Olson
- Class of 1967 Kathu Oneill
- Class of 1976 Samuel Orr
- Class of 1985 Gina Ortiz
- Class of 1997 Kenneth Ortiz
- Class of 1967 Henry Otoole
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About the Dorchester High School Alumni Directory
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