- Oak Grove Baptist Church Records, 1853/19591
- Office of Alumni Engagement records1
- Office of Communications and Marketing subject files, 19503
- Office of the Bursar Records, 1739/198712
- Office of the President Timothy J. Sullivan records, 1992/2005, bulk 1992/20051
- Office of the President, John Augustine Smith Records, 1814/1944, bulk 1814/18262
- Office of the President. Benjamin Stoddert Ewell records, 1848/1898, bulk 1866/18862
- Office of the President. James Blair Records, 1695/17472
- Office of the President. James Madison Records, 1775/1979, bulk 1776/18111
- Office of the Superintendent correspondence, 1840/19182
- Offley Family Papers, 1818/19161
- Ogden Family Papers, 1791/19462
- Ogden family papers, 1801/197915
- Ohio County (W. Va.) Court Records and Miscellaneous Papers, 1772/1954, bulk 1777/1930110
- Ohio Historical Papers, 1776/18721