Last names starting with "O"
- Class of 1989 James Oakley
- Class of 1978 Sheryl Odell
- Class of 2003 Derek Ohligschlager
- Idris Olatunmbi
- Class of 1964 Sandra Olmstead
- Class of 1986 Jill Olsen
- Class of 1992 Jennifer Olson
- Class of 1975 Mary Olson
- Class of 1993 Ismael Orozco
- Class of 2012 Nicole Ortiz
- Class of 1998 Melissa Oswego High (now Martin Kimber)
- Class of 1971 John Oswego High School (now Martin)
- Class of 1990 Penny Oswood
- Class of 1980 Sue Owens (formerly Kirtley)
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About the Oswego High School Alumni Directory
Check out all of the names of the Oswego High School alumni that attended high school in Oswego that are listed above. Registering will allow you to join the directory. For former Oswego High students from IL, you can view the class reunion information that has been posted by other site visitors. In addition, we encourage you to post your profile in the alumni directory, share information about the school activities you were involved with and reconnect with Oswego High School alumni.