Last names starting with "O"
- Class of 1979 Kelly O'Mahoney
- Class of 1979 Kelly O'Mahoney-Swieca
- Class of 1981 Tammy Ober
- Class of 1978 Patti Obrzut
- Class of 1992 Monica Ochoa
- Class of 1978 Cathryn Ocken
- Class of 1978 Cathy Okeefe
- Class of 1972 Lynn OLinski
- Class of 1982 Laura Olivera
- Class of 1974 Cindy Olsen
- Class of 1988 Julie Omaley
- Class of 1978 Maureen OMalley
- Class of 1976 Kathy Omally
- Class of 1980 Cynthia Ortega
- Class of 1990 Beth Orton
- Class of 1990 April Ostaszewski (formerly Mowry)
- Susan Overland
- Class of 2000 Naomi Ozarowski
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About the Mother Theodore Guerin High School Alumni Directory
Check out all of the names of the Mother Theodore Guerin High School alumni that attended high school in River Grove that are listed above. Registering will allow you to join the directory. Don't forget to upload your Mother Theodore Guerin High School pictures and check on the latest info about any Mother Theodore Guerin High School reunion.