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Alejandro Obregón (1920–1992), Colombian painter, muralist, sculptor and engraver
Bencho Obreshkov (1899–1970), Bulgarian painter
Jacques-François Ochard (1800–1870), French artist and teacher
Jacob Ochtervelt (1634–1682)
Leonard Ochtman (1854–1935), American Impressionist painter
Ogata Gekkō (1859–1920)
Ogata Kenzan (1663–1743)
Ogata Kōrin (1658–1716)
Juan O'Gorman (1905–1982), Mexican painter and architect
Ogura Yuki (1895–2000)
Dorothea Warren O'Hara (1873–1972), American ceramic artist
Ohara Koson (1877–1945)
Doug Ohlson (1936–2010)
Michalis Oikonomou (1888–1933)
Okada Beisanjin (1744–1820)
Okada Hanko (1782–1846)
Okamoto Tarō (1911–1996)
Georgia O'Keeffe (1887–1986), American artist
Aloysius O'Kelly (1853–1941)
Okuda Gensō (1912–2003)
Okumura Masanobu (1686–1764)
Okumura Togyu (1889–1990)
Jules Olitski (1922–2007), American abstract painter, printmaker, and sculptor
Viktor Oliva (1861–1928), Czech painter and illustrator
Nathan Oliveira (1928–2010), American painter, printmaker, and sculptor
Olivia Peguero (born 1963), Dominican American painter and sculptor
Ceferí Olivé (1907–1995), Catalan watercolor painter
Madge Oliver (1875–1924), British painter
Francisco Oller (1833–1917)
Frank O'Meara (1853–1888)
Onchi Koshiro (1891–1955)
Julian Onderdonk (1882–1922)
Ono Tadashige (1909–1990)
Maria van Oosterwijk (1630–1693), Dutch Baroque painter, specializing in still-lifes
Bruce Onobrakpeya (born 1932), printmaker, painter and sculptor
John Opie (1761–1807), Cornish historical and portrait painter
Andrea Orcagna (1320–1368), Italian painter, sculptor, and architect
William Quiller Orchardson (1835–1910), Scottish portraitist and painter of domestic and historical subjects
Edward Otho Cresap Ord, II (1858–1923), American painter & poet
Bryan Organ (born 1935), English painter
Emil Orlik (1870–1932), Austrian painter, etcher, and lithographer
Aleksander Orłowski (1777–1832), Polish painter, sketch maker, and pioneer of lithography
José Clemente Orozco (1883–1949), Mexican social realist painter
Sir William Orpen (1878–1931), Irish portrait painter
Manuel Ortiz de Zarate (1887–1946), Chilean painter
George Earl Ortman (1926–2015)
Erik Ortvad (1917–2008), Danish painter, founding member of the COBRA avant-garde movement
Walter Osborne (1859–1903)
Adriaen van Ostade (1610–1685), Dutch genre painter
Isaac van Ostade (1621–1649)
Ilya Ostroukhov (1858–1929)
Ota Masamitsu (1892–1975)
Otake Chikuha (1878-1936)
Johann Friedrich Overbeck (1789–1869), German painter and member of the Nazarene movement
Auseklis Ozols (born 1941), American painter and teacher