- O'Beil, Hedy. Artist file: miscellaneous uncatalogued material1
- O'Brien, Abigail. Artist file: miscellaneous uncatalogued material1
- O'Brien, Johnny. Artist file: miscellaneous uncatalogued material1
- O'Casey, Breon. Artist file: miscellaneous uncatalogued material1
- O'Day, Michie Stovall. Artist file: miscellaneous uncatalogued material1
- O'Donnell, Hugh, 1950-. Artist file: miscellaneous uncatalogued material1
- O'Donnell, Joe. Artist file: miscellaneous uncatalogued material1
- O'Donovan, William Rudolph, 1844-1920. Artist file: miscellaneous uncatalogued material1
- O'Gallagher, Liam. Artist file: miscellaneous uncatalogued material1
- O'Halloran, Greg. Artist file: miscellaneous uncatalogued material1
- O'Hara, Eliot, 1890-1969. Artist file: miscellaneous uncatalogued material1
- O'Kane, Tim. Artist file: miscellaneous uncatalogued material1
- O'Keeffe, Georgia, 1887-1986. Artist file: miscellaneous uncatalogued material1
- O'Kelley, Mattie Lou. Artist file: miscellaneous uncatalogued material1
- O'Leary, Eric. Artist file: miscellaneous uncatalogued material1