O
- O'Brien, Abigail
- O'Keeffe, Georgia
- Oberberger, Josef
- Oberhoff, Ernst
- Oberhuber, Oswald
- Oberpurger, Hermann
- Odenbach, Marcel
- Odermatt, Siegfried
- Oehlen, Adolf
- Oehlen, Albert
- Oehlen, Markus
- Oehlmann, Peter
- Oehm, Herbert
- Oelze, Richard
- Oiwa, Oscar
- Oldenburg, Claes
- Olitski, Jules
- Olson, R.A.
- Ono, Yoko
- Onslow-Ford, Gordon
- Oppenheim, Dennis
- Oppermann, Anna
- Oppermann, Wolfgang
- Orosz, István
- Orozco, Gabriel
- Ortega, José
- Orth, Dietrich
- Ortiz, Angelica Fernandez
- Ortiz, Daniela
- Osterwalder, Hans Ulrich
- Ott + Stein
- Oudot, Roland
- Ovejero, José Maria
- Owusu-Ankomah, Kwesi
- Ozenfant, Amédée
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