Last names starting with "O"
- Class of 1988 Maura O Leary (formerly Studley)
- Class of 1970 Joseph OConnor
- Class of 2000 Anthony Octavio
- Class of 1971 Lorraine ODonnell
- Class of 1992 Christine Ohara
- Class of 1982 Denis Ohara
- Class of 1996 William Olson
- Class of 1968 Margaret Oneil
- Class of 1969 Linda Orlando
- Class of 1973 Jack Orouke
- Class of 1987 Lourdes Osegueda
- Elena Otta
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About the Immaculate High School Alumni Directory
Check out all of the names of the Immaculate High School alumni that attended high school in Danbury that are listed above. Registering will allow you to join the directory. If you are a Immaculate alumn, we encourage you to register and be sure to sign up for the alumni newsletter.