O Section
- OBICI, Giuseppe
- OCHTERVELT, Jacob
- ODERISI, Pietro
- ODERISIUS OF BENEVENTO
- ODEVAERE, Joseph-Denis
- OEHME, Ernst Ferdinand
- OGGIONO, Marco d'
- OLIVER, Isaac
- OLIVIER, Ferdinand
- OLIVIERI, Pier Paolo
- OLIVIERI, Giovanni Domenico
- OLLIVIER, Michel-Barthélémy
- OMMEGANCK, Balthazar Paul
- OMODEO, Giovanni Antonio
- OOST, Flemish family of painters
- OOSTERWIJK, Maria van
- OPIE, John
- OPPENORDT, Alexandre-Jean
- ORCAGNA
- ORDÓÑEZ, Bartolomé
- ORLEY, Bernaert van
- ORLOVSKY, Boris Ivanovich
- ORRENTE, Pedro
- ORSOLINO, Tommaso
- ORTELIUS, Abraham
- ORTOLANO
- OS, van, Dutch family of painters
- OSONA, Rodrigo de, the Younger
- OSTADE, van, Dutch family of artists
- OSTENDORFER, Michael
- OTTIN, Auguste
- OTTONI, Lorenzo
- OUDINÉ, Eugène André
- OUDRY, Jean-Baptiste
- OUWATER, Dutch painters (not related)
- OVENS, Jürgen
- OVERBECK, Friedrich