Francesco Nuvolone (1608–1665 ), 1 artwork : INV 709 (ID) O François Octavien (1682–1740), 1 artwork : INV 6993 (ID) Marco d'Oggiono (c. 1475 – 1530 ), 2 artworks : RF 878, INV 705 (ID's) Michel-Barthélémy Ollivier (1712–1784), 1 artwork : INV 7007 (ID) Balthasar Paul Ommeganck (1755–1826), 2 artworks : INV 1671, INV 1670 (ID's) Crescenzio Onofri (1632–1698), 1 artwork : INV 900 (ID) Jacob van Oost (1603–1671), 1 artwork : INV 1930 BIS (ID) Jacob van Oost the Younger (1639–1713), 1 artwork : INV 1672 (ID) Jacob Cornelisz van Oostsanen (1472–1533), 1 artwork : RF 1945-20 (ID) John Opie (1761–1807), 1 artwork : RF 307 (ID) Deodato di Orlandi (1284–1315), 1 artwork : RF 1945 21 (ID) Bernard van Orley (1490–1541), 2 artworks : RF 1976–1, RF 1473 (ID's) Jan van Os (1744–1808), 3 artworks : RF 3707, INV 1678 (ID's) Adriaen van Ostade (1610–1685), 16 artworks : MI 951, MI 951 (ID's) Isaac van Ostade (1621–1649), 6 artworks : MI 952, MI 950 (ID's) Jean-Baptiste Oudry (1686–1755), 7 artworks : DL 1970–16, RF 1989-26 (ID's) Jacques Charles Oudry (1720–1778 ), 1 artwork : RF 1942-9 (ID) Pierre Justin Ouvrié (1806–1879), 1 artwork : INV 20858 (ID) Alessandro Varotari (1588–1649), 1 artwork : INV 730 (ID) P Michele Pagano (c. 1697 – 1732), 1 artwork : INV 8811 (ID) Amable Louis Claude Pagnest (1790–1819), 2 artworks : INV 7077, MI 789 (ID's) Augustin Pajou (1730–1809), 2 artworks : RF 727, RF 1964-5 (ID's) Anthonie Palamedesz. (1601–1673), 6 artworks : RF 914, RF 2878 (ID's) Palma il Giovane (1546–1628), 4 artworks : RF 2110, MI 877 (ID's) Antonio Palma (c. 1510 – 1575 ), 1 artwork (attributed) : INV 120 (ID) Palma Vecchio (1479–1528), 1 artwork : INV 402 (ID) Marco Palmezzano (c. 1459 – c. 1539), 1 artwork : MI 680 (ID) Giovanni Paolo Pannini (1691–1765), 13 artworks : RF 1983–65, RF 1944-22 (ID's) Juan Pantoja de la Cruz (1553–1608), 1 artwork : RF 3817 (ID) Pietro Paolini (1603–1681), 1 artwork : RF 1981-44 (ID) Giovanni di Paolo (c. 1403 – 1482), 1 artwork : RF 672 (ID) Paolo Uccello (1396–1475), 1 artwork : MI 469 (ID) Dominique Papety (1815–1849), 1 artwork : RF 1982-27 (ID) Bernardo Parentino (1437–1531), 1 artwork : MI 592 (ID) Joseph Parrocel (1646–1704), 1 artwork : INV 7089 (ID) Charles Parrocel (1688–1752), 2 artworks : INV 7123, INV 7123 (ID's) Jules Pasqualini (1820–1886),