Nach Künstler
- O'Neil, Henry Nelson
- Oberman, Anthony
- Obrovsky, Jakub
- Odelmark, Frans Wilhelm
- Odevaere, Joseph-Denis
- Oehmichen, Hugo
- Oliver, Isaac
- Olivier, Ferdinand
- Olrik, Ole Henrik
- Opie, John
- Oppenoorth, Willem Johannes
- Orpen, William Newenham Montague
- Orrente, Pedro
- Ortega, Martin Rico
- Ortiz, José Benlliure
- Ortolano
- Osborne, Walter Frederick
- Osterlind, Allan
- Ottesen, Otto Didrik
- Ouless, Walter William
