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- O'Keeffe, Georgia - 20 artworks
- Obermayer, Andrea - 10 artworks
- Ochs, Jacques - 11 artworks
- Ochtervelt, Jacob - 6 artworks
- Odevaere, Joseph-Denis - 7 artworks
- Oehme, Ernst Ferdinand - 3 artworks
- Ofili, Chris - 45 artworks
- Oggiono, Marco d' - 3 artworks
- OGM - 1 artworks
- Ogorzelec, Ludwika - 11 artworks
- Ohnesorge, Nana - 25 artworks
- Oiticica, Hélio - 0 artworks
- Okada, Kenzo - 8 artworks
- Okun, Edward - 2 artworks
- Oldenburg, Claes - 10 artworks
- Oldfield, Alan - 2 artworks
- Olitski, Jules - 20 artworks
- Oliveira, Nathan - 29 artworks
- Olivier, Ferdinand Johann von - 3 artworks
- Olley, Margaret - 25 artworks
- Olsen, John - 18 artworks
- Ondák, Roman - 27 artworks
- Ontani, Luigi - 12 artworks
- Ooms, Karel - 7 artworks
- Oost, Jacob van the Elder - 7 artworks
- Oost, Jacob van the Younger - 4 artworks
- Oosterwijk, Maria van - 1 artworks
- Opalka, Roman - 2 artworks
- Oppenheim, Dennis - 3 artworks
- Oppenheim, Guido - 1 artworks
- Oppenheim, Meret - 3 artworks
- Oprea, Maia Stefana - 42 artworks
- Opsomer, Isidore - 11 artworks
- Orbán, Dezsö (Desiderius) - 4 artworks
- Ördög, Noémi - 2 artworks
- Oren, Ariel - 4 artworks
- Orlai Petrics, Soma - 40 artworks
- Orley, Bernaert van - 17 artworks
- Orlowski, Alexander - 33 artworks
- Orozco, Jose Clemente - 22 artworks
- Orrente, Pedro - 3 artworks
- Ország, Lili - 20 artworks
- Ortega, Damián - 6 artworks
- Ortolano - 7 artworks
- Osmolovsky, Anatoly - 2 artworks
- Osona, Rodrigo de the Younger - 1 artworks
- Ostade, Adriaen van - 45 artworks
- Ostade, Isaack van - 17 artworks
- Ottmár, Alexander - 4 artworks
- Ötvös, Nagy Ferenc - 2 artworks
- Ötvös, Zoltán - 10 artworks
- Ouderaa, Pierre Jean van der - 7 artworks
- Oudry, Jean-Baptiste - 6 artworks
- Oulton, Thérèse - 29 artworks
- Oursler, Tony - 23 artworks
- Ouwater, Albert van - 1 artworks
- Ouwater, Isaak - 2 artworks
- Overbeck, Friedrich - 5 artworks
- Owen, Wayde - 14 artworks
- Owens, Laura - 25 artworks
- Ozenfant, Amédée - 10 artworks
- All artworks: 70,514
- Artists: 4,331
- Museums: 2,354
- Movements: 103
- Themes: 20
- Techniques: 41
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