- O.D. Linder, Compiler, Genealogy Records Regarding the Boyce, Dever, Gibson, and Linder Families, 1860/2000, bulk 1900/20001
- O.W. Riegel Papers, 1900/199284
- ODU PREVIEW and Orientation Collection, 1978/20082
- Oak Grove Baptist Church collection, 1924/19451
- Obituaries of Ritchie and Tyler County Residents, 1947/20141
- Office of Academic Advising records, 1989/20022
- Office of Admission records, 1861/20217
- Office of Admissions records - University of Virginia School of Law, 1971/20101
- Office of Affirmative Action Records, 1973/20073
- Office of Affirmative Action Records, 1977/2009, bulk 1977/19881
- Office of Alumni Engagement records2
- Office of Alumni Relations Records, 1960/201856
- Office of Auxiliary Services Records, 1966/20035
- Office of Career Services records - University of Virginia School of Law, 1982/20084
- Office of Communications and Marketing audio and video collections19