Last names starting with "O"
- Patricia O Neil
- Class of 1961 Patricia O Neill
- Class of 1969 Maryellen Ocallaghan
- Class of 1969 Diedre Oconnor
- Class of 1964 Gail Oconnor
- Class of 1998 Brian ODonoghue
- Class of 1979 Ellen Ohrnberger
- Class of 1980 Gene Ohrnburger
- Class of 1980 Jean Ohrnburger
- Class of 1961 Barbara OLeary
- Class of 1970 Donald Olson
- Class of 1992 Barbara Oneill
- Class of 1984 Ann Orhnberger
- Class of 1976 Donna Orlando
- Class of 1965 Dan OShea
- Class of 1982 Wayne Otto
- Class of 1964 Pamela Overwalle
- Class of 1973 Terry Owens
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About the St Marys High School Alumni Directory
Check out all of the names of the St Marys High School alumni that attended high school in Manhasset that are listed above. Registering will allow you to join the directory. If you are a St Marys alumn, we encourage you to register and be sure to sign up for the alumni newsletter.