A-Z Listing: O
- Alejandro Obregon , 1920 - 1992 , 10 artworks
- Octavio Ocampo , born 1943 , 36 artworks
- Jacob Ochtervelt , 1634 - 1682 , 40 artworks
- John O'Connor , 1830 - 1889 , 16 artworks
- Roderic O'Conor , 1860 - 1940 , 58 artworks
- Albert Oehlen , born 1954 , 11 artworks
- Richard Oelze , 1900 - 1980 , 15 artworks
- Chris Ofili , born 1968 , 45 artworks
- Doug Ohlson , 1936 - 2010 , 24 artworks
- Rolf Ohst , born 1952 , 13 artworks
- Helio Oiticica , 1937 - 1980 , 16 artworks
- Kenzo Okada , 1902 - 1982 , 22 artworks
- Taro Okamoto , 1911 - 1996 , 10 artworks
- Georgia O'Keeffe , 1887 - 1986 , 237 artworks
- Okumura Togyu , 1889 - 1990 , 11 artworks
- Necmeddin Okyay , 1883 - 1976 , 17 artworks
- Claes Oldenburg , born 1929 , 24 artworks
- Oleh Denysenko , born 1960 , 24 artworks
- Mikhail Olennikov , 1934 - c.2014 , 24 artworks
- Jules Olitski , 1922 - 2007 , 0 artworks
- Nathan Oliveira , 1928 - 2010 , 33 artworks
- Francisco Oller , 1833 - 1917 , 27 artworks
- Mihai Olos , 1940 - 2015 , 26 artworks
- Olowe of Ise , c.1873 - c.1938 , 13 artworks
- Albert Julius Olsson , 1864 - 1942 , 46 artworks
- Frank O'Meara , 1853 - 1888 , 15 artworks
- Koshiro Onchi , 1891 - 1955 , 40 artworks
- Robert Julian Onderdonk , 1882 - 1922 , 128 artworks
- Rose O'Neill , 1874 - 1944 , 14 artworks
- Fusun Onur , born 1938 , 18 artworks
- Roman Opalka , 1931 - 2011 , 14 artworks
- Julian Opie , born 1958 , 13 artworks
- Dennis Oppenheim , 1938 - 2011 , 11 artworks
- Meret Oppenheim , 1913 - 1985 , 18 artworks
- Max Oppenheimer , 1885 - 1954 , 16 artworks
- Silviu Oravitzan , born 1941 , 21 artworks
- Orazio Gentileschi , 1563 - 1639 , 58 artworks
- Volodymyr Orlovsky , 1842 - 1914 , 66 artworks
- Alexander Orlowski , 1777 - 1832 , 33 artworks
- Haralampi G. Oroschakoff , born c.1955 , 12 artworks
- Jose Clemente Orozco , 1883 - 1949 , 65 artworks
- Carlos Orozco Romero , 1896 - 1984 , 23 artworks
- William Orpen , 1878 - 1931 , 68 artworks
- Monique Orsini , born 1937 , 36 artworks
- Orthodox Icons , born c.330 , 437 artworks
- Walter Osborne , 1859 - 1903 , 29 artworks
- Hafiz Osman , 1642 - 1698 , 14 artworks
- Adriaen van Ostade , 1610 - 1685 , 91 artworks
- Isaac van Ostade , 1621 - 1649 , 21 artworks
- Anna Ostroumova-Lebedeva , 1871 - 1955 , 95 artworks
- Jorge Oteiza , 1908 - 2003 , 0 artworks
- Petre Otskheli , 1907 - 1937 , 21 artworks
- Otto Constantin , born 1990 , 5 artworks
- Jean-Baptiste Oudry , 1686 - 1755 , 114 artworks
- Ramon Oviedo , born 1924 , 41 artworks
- Owon , 1843 - 1897 , 14 artworks
- Amedee Ozenfant , 1886 - 1966 , 16 artworks