Last names starting with "O"
- Class of 1977 Delia O'brien
- Eileen O'connor
- Class of 1975 Maureen O'Keefe
- Class of 1974 Colleen O'leary
- Class of 1972 James O'leary
- Class of 1970 Robert OBoyle
- Class of 1966 Dennis Oconnell
- Class of 1981 Joan ODwyer
- Karina Oquendo
- Lorraine ORegan
- Timothy Orourke
- Class of 1975 Mary Oshea
- Class of 1975 John Osullivan
- Nicholas Otarola
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About the Holy Trinity Diocesan High School Alumni Directory
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