Last names starting with "O"
- Class of 1960 Marie O'Brien
- Sharron Obrien
- Class of 1957 Shiela OBrien
- Class of 1966 Geri Oconnell
- Class of 1949 Mary Oconnell
- Patricia Oconnell
- Cecelia Ohara
- Class of 1958 Catherine OLeary
- Class of 1959 Theresa OLeary
- Class of 1959 Theresa P OLeary
- Class of 1970 Regina Olson
- Class of 1959 Carol Omiecinski
- Class of 1959 Carol Omiesinski
- Catherine Oneil
- Class of 1959 Helen Otte
Looking for Mercy High School Chicago, IL alumni not listed? If so, check out Classmates.com® - hundreds of more MHS alumni have posted their profiles.
About the Mercy High School Alumni Directory
Check out all of the names of the Mercy High School alumni that attended high school in Chicago that are listed above. Registering will allow you to join the directory. If you are a former student of Mercy in Chicago, Illinois, register now to add your name.