O Artist List
| O'Connell, Madeleine (3) | O'Connor, Dylan (2) | O'Galop (1) | O'Hagan, Desmond (6) |
| O'Kane, Dermot (36) | O'Mara, James (4) | O'Neal, Janet (2) | O'Neil, Henry Nelson (4) |
| O'Neill, Brian (5) | O'Toole, Michael (10) | O'Toole, Nancy (10) | O'Toole, Tim (101) |
| O, Danny | Oakes, Robert S. (1) | Oakley, Thorton (46) | Obermayer, E. (1) |
| Ochtervelt, Jacob (2) | Odazzi, Giovanni (2) | Odness, Greg (1) | Ogden, Henry Alexander (8) |
| Oge, Eugene (2) | Ogilby, John (3) | Okamoto, Naoki (4) | OKRE (4) |
| Olivain, Claire (2) | Oliver, Bunny (8) | Oliver, William (1) | Olivier, Marc (11) |
| Oller, Francisco (1) | Ollivier, Michel Barthelemy (3) | Olsen, Jon (4) | Olsenius, Richard (9) |
| Olson, Randy (9) | OM (3) | Oman, Dawn (2) | Omelianchuk, Linda (8) |
| Oosten, Isaak van (4) | Open Journey (9) | Oppler, Ernest (1) | Orazi, Manuel (1) |
| Ord, E.O.C. (1) | Orley, Bernard van (10) | Orlovskii, Aleksandr Osipovich (2) | Orlovskii, Vladimir Donatovich (1) |
| Orpen, Sir William (10) | Orpen, William Newenham (1) | Orr, Maya (2) | Orsi (1) |
| Ortega, Xavier (7) | Ortelius, Abraham (3) | Ortenstone, Nancy (63) | Ortiz (2) |
| Osbjorn, Susan (18) | Osborn, Jaqueline (7) | Osborne, Susan (94) | Ostade, Adriaen Jansz. van (1) |
| Ostergaard, LuAnn (29) | Osthaus, E. H. (2) | Osthaus, Edmund Henry (1) | Ostlund, Leif (4) |
| Ou, Chujian (1) | Oudh (1) | Oudry, Jacques Charles (1) | Oudry, Jean-Baptiste (17) |
| Ouimette, Gene (8) | Ourry (1) | Overbeek, Will Van (2) | Owen, Wade (4) |
| Owen, Wayde (3) |
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