- O'Neal, Alan. Artist file: miscellaneous uncatalogued material1
- O'Neal, Mary Lovelace. Artist file: miscellaneous uncatalogued material1
- O'Shaughnessy Family Papers138
- O'Shaughnessy, Peter. Artist file: miscellaneous uncatalogued material1
- O'Shea, Mick. Artist file: miscellaneous uncatalogued material1
- O'Sickey, Joseph B. Artist file: miscellaneous uncatalogued material1
- O'Sullivan, Daniel. Artist file: miscellaneous uncatalogued material1
- O'Sullivan, Timothy H, 1840-1882. Artist file: miscellaneous uncatalogued material1
- O'Thearling, Sibyl. Artist file: miscellaneous uncatalogued material1
- O. A. Hawkins Collection of
Virginiana,
1770-187727
- O. Alan Gianniny Reports,
1977-19881
- O. Allery calligraphic Lord's Prayer1
- O. D. Lambert Research Notes and Biographical Material on Stephen B. Elkins1
- O. Gaines Whitley, Sr., Photograph Albums8
- O. Henry Collection78