Last names starting with "O"
- Class of 1971 James O'Connor
- Class of 1971 Anne O'Donnell
- Class of 1965 Mark O'Donnell
- James O'Hara
- Class of 1964 Stan O'Leary
- Mark Och
- Class of 1979 Daniel Oconnell
- Class of 1996 Meghan Oconnell
- Sean Oh
- Charles Ohara
- Class of 1973 Joan Olejowski
- Class of 1974 Stephen Olinik
- Class of 1980 Theresa Olone
- Class of 1968 Maureen Omalley
- Class of 1971 Joseph Oneil
- Class of 1965 Karen Oneill
- Class of 1971 Marie Opdyke
- Class of 1964 Lorraine Oriente
- Class of 1972 Robert Ortenzio
- Class of 1985 Christopher Owens
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About the Bishop Mcdevitt High School Alumni Directory
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