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X-Z
Randy Joe O'Brezar (born Seattle, WA 1954)
George O'Connell (born Madison, WI 1926)
Harold O'Connor (born Utica, NY 1941)
Thom O'Connor (born Detroit, MI 1937)
Thomas O'Donohue (born New York City 1907)
William Rudolf O'Donovan (born Preston County, VA 1844-died New York City 1920)
Eliot O'Hara (born Waltham, MA 1890-died Washington, DC 1969)
Georgia O'Keeffe (born Sun Prairie, WI 1887-died Santa Fe, NM 1986)
Mattie Lou O'Kelley (born Maysville, GA 1908-died Decatur, GA 1997)
Dennis O'Neil (born Dayton, OH 1946)
Rose Cecil O'Neill (born Wilkes-Barre, PA 1874-died Springfield, MO 1944)
Timothy H. O'Sullivan (born Ireland 1840-died New York City 1882)
Violet Oakley (born Bergen Heights, NJ 1874-died Philadelphia, PA 1961)
Chiura Obata (born Okayama-ken, Japan 1885-died Berkeley, CA 1975)
Karl Oberteuffer (born Croisic, France 1908-died Gloucester, MA 1958)
Leonard Ochtman (born Zonnemaire, Netherlands 1854-died Cos Cob, CT 1934)
Johannes Adam Simon Oertel (Furth, Germany 1823-died Vienna, VA 1909)
Jeffrey Oestreich (born St. Paul, MN 1947)
Thomas S. Officer (born Carlisle, PA 1810-died San Francisco, CA 1859)
John Ogborne (English, born Chelmsford, England 1725-died London, England 1795)
Gustavo Ojeda (born Havana, Cuba 1958-died New York City 1989)
Naul Ojeda (born Montevideo, Uruguay 1939-died Arlington, VA 2002)
Masuo Ojima (born Shizuoka, Japan 1949)
Kenzo Okada (born Yokohama, Japan 1902- died Tokyo, Japan 1982)
Arthur Okamura (born Long Beach, CA 1932)
Claes Oldenburg (born Stockholm, Sweden 1929)
Otis Oldfield (born Sacramento, CA 1890-died San Francisco, CA 1969)
Elizabeth Olds (born Minneapolis, MN 1896-died Sarasota, FL 1991)
Moses Oley (born Lodz, Poland 1898-died New York City 1978)
Ivan G. Olinsky (born Elizabethgrad, Russia 1878-died United States 1962)
Jules Olitski (born Snovsk, U.S.S.R. 1922-died New York City 2007)
Nathan Oliveira (born Oakland, CA 1928)
Arthur Ollman (born Milwaukee, WI 1947)
Michael Olszewski (born Baltimore, MD 1950)
Frank K. Ominsky (born New York City 1898-died New Haven, CT 1981)
Balthasar Paul Ommeganck (Belgian, born Antwerp, Belgium 1755-died Antwerp, Belgium 1826)
Judy Onofrio (born New London, CT 1939)
Gordon Onslow-Ford (born Wendover, England 1912-died Inverness, CA 2003)
Jeanne B. Oosting (Dutch, born Leeuwarden, Netherlands 1898-died 1994)
Pavel Opocensky (Czechoslovakian, born Karlovy Vary, Czechoslovakia 1954)
Ellen Oppenheimer (born White Plains, NY 1952)
John Opper (born Chicago, IL 1908-died Amagansett, NY 1994)
Oqwa Pi (born San Ildefonso Pueblo, NM 1899-died Los Alamos, NM 1971)
Ruth Orkin (born Boston, MA 1921-died New York City 1985)
Bernard van Orley (Flemish, born Brussels, Belgium ca.1492-died Brussels, Belgium ca.1542)
Gregory Orloff (born Kiev, Russia 1890)
Jose Clemente Orozco (Mexican, born Ciudad Guzman, Mexico 1883-died Guadalajara, Mexico 1949)
Elliot Orr (born New York City 1904-died Naples, FL 1997)
J. W. Orr (born Ireland 1815-died Jersey City, NJ 1887)
Louis Orr (born Hartford, CT 1879-died Paris, France 1966)
Jose Benito Ortega (born La Cueva, NM 1858-died Raton, NM 1941)
H. Willard Ortlip (born Norristown, PA 1886-died 1964)
George Ortman (born Oakland, CA 1926)
Robert Osborn (born Oshkosh, WI 1904-died Salisbury, CT 1994)
Cynthia A. Osborne (born New Milford, CT 1947)
Malcolm Osborne (English, born Frome, England 1880-died 1963)
Jere Osgood (born New York City 1936)
Roselle H. Osk (born New York City 1884-died New York City 1954)
Rude Osolnik (born Dawson, NM 1915-died Berea, KY 2001)
Pepon Osorio (born Santurce, Puerto Rico 1955)
Alfonso Ossorio (born Manila, Philippines 1916-died New York City 1990)
Abbo Ostrowsky (born Elisabetgrad, Russia 1889-died New York City 1975)
Arthur Osver (born Chicago, IL 1912)
Bass Otis (born Bridgewater, MA 1784-died Philadelphia, PA 1861)
George Demont Otis (born Memphis, TN 1879-died Kentfield, CA 1962)
Jacqueline Ott (born Camden, NJ 1948)
Aubrey C. Ottley (born St. Thomas, Virgin Islands)
John Outrim (English, born 1810-died after 1874)
Kim Overstreet (born Christiansburg, VA 1955)
James Owen (active mid 19th century)
Bill Owens (born San Jose, CA 1938)
Winnie Owens-Hart (born Washington, DC 1949)
Reid Ozaki (born Hilo, HI 1951)