Last names starting with "O"
- Class of 1973 Dianne O'brian
- Class of 1977 Karen Oberg
- Class of 1972 Helen Oberman
- Class of 1970 Fred Obermann
- Class of 1973 Dianne Obrien
- Class of 1971 Lawrence ODonnell
- Class of 1992 Jennifer Oreszczyn
- Class of 1988 Marybeth Orourke
- Class of 1985 Anthony Osburn
- Class of 1983 Donald Ostmann
- Class of 1987 Andrew Ostroff
- Class of 1972 Jacob Ostroff
- Class of 1972 Lynn Ounan
- Class of 1971 John Owens
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