Last names starting with "O"
- Talissa O'Conner
- Class of 1973 Debbie Oberholzer
- Wendy Obrien
- Class of 2001 Melissa Oconner
- Class of 2002 Andrew Ohair
- Class of 1983 Frankie Oldom
- Class of 1984 Martin Oliver
- Class of 1986 Quentin Oliver
- Class of 1977 Vickie Oliver
- Class of 1975 Bradley ONeal
- Class of 1966 Fredrick Oney
- Class of 1974 Karen Oney
- Class of 1958 Teletha Overshiner
- Class of 1989 Melissa Overton
- Class of 1949 Thomas Ox
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About the Greencastle High School Alumni Directory
Check out all of the names of the Greencastle High School alumni that attended high school in Greencastle that are listed above. Registering will allow you to join the directory. Don't forget to upload your Greencastle High School pictures and check on the latest info about any Greencastle High School reunion.