- O.D. Linder, Compiler, Genealogy Records Regarding the Boyce, Dever, Gibson, and Linder Families, 1860/2000, bulk 1900/20001
- O.J. Morrison Department Stores Company (West Virginia and Ohio) Records, 1910/1985, bulk 1940/19501
- O.W. Riegel Papers, 1900/1992758
- ODU Monarch Community Alliance Records, 1964/19864
- ODU PREVIEW and Orientation Collection, 1978/20081
- Oak Grove Baptist Church collection, 1924/19455
- Obituaries of Ritchie and Tyler County Residents, 1947/20141
- Ocean View, Seaside, and Seaview Amusement Parks Collection, 1919/1991, bulk 1940/197929
- Office of Admission records, 1861/20219
- Office of Admissions annual reports, 1961/19952
- Office of Admissions records - University of Virginia School of Law, 1971/20102
- Office of Affirmative Action Records, 1973/20071
- Office of Alumni Engagement records5
- Office of Alumni Relations Records, 1960/201857
- Office of Auxiliary Services Records, 1966/20031