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- O'Keeffe, Georgia– 20 artworks uploaded – artworks
- Ochtervelt, Jacob– 6 artworks uploaded – artworks
- Odevaere, Joseph-Denis– 3 artworks uploaded – artworks
- Oehme, Ernst Ferdinand– 3 artworks uploaded – artworks
- Ofili, Chris– 45 artworks uploaded – artworks
- Oggiono, Marco d'– 3 artworks uploaded – artworks
- Okada, Kenzo– 8 artworks uploaded – artworks
- Okun, Edward– 2 artworks uploaded – artworks
- Oldenburg, Claes– 10 artworks uploaded – artworks
- Olitski, Jules– 20 artworks uploaded – artworks
- Olivier, Ferdinand Johann von– 3 artworks uploaded – artworks
- Ontani, Luigi– 12 artworks uploaded – artworks
- Oost, Jacob van the Elder– 6 artworks uploaded – artworks
- Oost, Jacob van the Younger– 2 artworks uploaded – artworks
- Oosterwijk, Maria van– 1 artworks uploaded – artworks
- Opalka, Roman– 2 artworks uploaded – artworks
- Oppenheim, Meret– 3 artworks uploaded – artworks
- Oprea, Maia Stefana– 5 artworks uploaded – artworks
- Orbán, Dezsö (Desiderius)– 3 artworks uploaded – artworks
- Ördög, Noémi– 2 artworks uploaded – artworks
- Orlai Petrics, Soma– 40 artworks uploaded – artworks
- Orley, Bernaert van– 14 artworks uploaded – artworks
- Orlowski, Alexander– 33 artworks uploaded – artworks
- Orozco, Jose Clemente– 22 artworks uploaded – artworks
- Orrente, Pedro– 3 artworks uploaded – artworks
- Ország, Lili– 20 artworks uploaded – artworks
- Ortega, Damián– 6 artworks uploaded – artworks
- Osona, Rodrigo de the Younger– 1 artworks uploaded – artworks
- Ostade, Adriaen van– 42 artworks uploaded – artworks
- Ostade, Isaack van– 16 artworks uploaded – artworks
- Ottmár, Alexander– 4 artworks uploaded – artworks
- Ötvös, Nagy Ferenc– 2 artworks uploaded – artworks
- Ötvös, Zoltán– 10 artworks uploaded – artworks
- Oudry, Jean-Baptiste– 5 artworks uploaded – artworks
- Ouwater, Albert van– 1 artworks uploaded – artworks
- Ouwater, Isaak– 2 artworks uploaded – artworks
- Overbeck, Friedrich– 4 artworks uploaded – artworks
- Ozenfant, Amédée– 10 artworks uploaded – artworks
