O Section
- OBBERGEN, Anthonis van
- OBICI, Giuseppe
- OBRIST, Hermann
- OCAMPO, Andrés de
- OCHTERVELT, Jacob
- O'CONNOR, James Arthur
- ODEKERKEN, Willem van
- ODERISI, Pietro
- ODERISI, Roberto d'
- ODERISIUS OF BENEVENTO
- ODEVAERE, Joseph-Denis
- OEHME, Ernst Ferdinand
- OEVER, Hendrick ten
- OGGIONO, Marco d'
- OHLMÜLLER, Joseph Daniel
- OLBRICH, Josef Maria
- OLIS, Jan
- OLIVEIRA, Mateus Vicente de
- OLIVER, English family of miniature painters and draughtsmen, of French origin
- OLIVIER, Ferdinand
- OLIVIERI, Pier Paolo
- OLIVIERI, Giovanni Domenico
- OLLIVIER, Michel-Barthélémy
- OMMEGANCK, Balthazar Paul
- OOST, Flemish family of painters
- OOSTEN, Izaac van
- OOSTERWIJK, Maria van
- OPIE, John
- OPITZ, Georg Emanuel
- OPPENORDT, French family of artists
- OPSTAL, Gerard van
- ORCAGNA
- ORDÓÑEZ, Bartolomé
- ORIOLI, Pietro di Francesco degli
- ORLEY, Bernaert van
- ORLEY, Jan van
- ORLOVSKY, Aleksandr Osipovich
- ORLOVSKY, Boris Ivanovich
- ORRENTE, Pedro
- ORSI, Lelio
- ORSI, Tranquillo
- ORSOLINO, Tommaso
- ORTELIUS, Abraham
- ORTOLANO
- OS, van, Dutch family of painters
- OSONA, Spanish family of painters
- OSTADE, van, Dutch family of artists
- OSTENDORFER, Michael
- OTTIN, Auguste
- OTTONI, Lorenzo
- OUDINÉ, Eugène André
- OUDRY, French family of painters
- OUTIN, Pierre
- OUVRIER, Jean
- OUWATER, Dutch painters (not related)
- OVENS, Jürgen
- OVERBECK, Friedrich
- OVERBEKE, Adriaen van
