Last names starting with "O"
- Class of 1975 James O'Neill
- Class of 1993 Paul Ockel
- Class of 1925 Mary Oconnor
- Class of 2009 Chrissy Odonnell
- Class of 1975 Peggy Odonnell
- Class of 1983 Lorraine Ofray
- Class of 1969 Ellen OKane
- Class of 1977 John Okuniewicz
- Class of 1979 Deborah Oldock (now Basick)
- Class of 1974 Chis Olender
- Class of 2013 Allison Oliveira
- Class of 2013 Matia Olwaski
- Class of 1976 James ON
- Stephany Ormeno
- Anthony Ortiz
- Class of 1967 Ronald Osowski Memorial
- Class of 1982 Yasmin Ospina
- Class of 1977 Fred Ostercorn
- Joanne Ostrman
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