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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
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