William J. O'Brien b. 1975

Ann O'Connor 1938–2021

Brian (Patrick Ireland) O'Doherty b. 1928

Georgia O'Keeffe 1887–1986

Mattie Lou O'Kelley 1908–1997

Dan O'Neal b. 1956

Robyn O'Neil b. 1977

Daniel O'Neill 1920–1974

Terry O'Neill b. 1938

John O'Reilly 1930–2021

Edward Oakes 1891–1960

Michael Oates

Robert Oberheim b. 1938

Mary Obering 1937–2022

Roberto Obregon b. 1946

Alejandro Obregón 1920–1992

Manuel Ocampo b. 1965

Jayme Odgers 1939–2022

Markus Oehlen b. 1956

Jeff Oestreich b. 1947

George Ferdinand Of 1876–1954

Giovanni Offredi 1927–2007

Chris Ofili b. 1968

Yutaka Ohashi 1923–1989

Katsuya Ohgita b. 1957

Yoichi Ohira 1946–2022

Doug Ohlson 1936–2010

Folke Ohlsson 1919–2003

George E. Ohr 1857–1918

Arthur Okamura 1932–2009

Eugenia Sumiye Okoshi 1921–2008

Adrian Olabuenaga b. 1955

Erwin Olaf b. 1959

Joseph Maria Olbrich 1867–1908

Maxime Old 1910–1991

Claes Oldenburg 1929–2022

Claes Oldenburg and Coosje van Bruggen

Ivan Olinsky 1878–1962

Jules Olitski 1922–2007

Nathan Oliveira 1928–2010

William Oliver 1823–1901

Jacco Olivier b. 1972

Fritz Olsen

Hans Olsen 1902–1983

Kjell Erik Killi Olsen b. 1952

Alex Olson b. 1978

Yngve Harald Olsson for the Kalo Shop 1896–1970

Omega

Eo Omwake b. 1946

Luigi Onesto b. 1935

Yoko Ono b. 1933

Judy Onofiro b. 1939

Toshinobu Onosato 1912–1986

Othniel A. Oomittuk Jr.

Catherine Opie b. 1961

Julian Opie b. 1958

Dennis Oppenheim 1938–2011

Meret Oppenheim 1913–1985

John Opper 1908–1994

Peter Opsvik b. 1939

Manuel Orazi 1860–1934

Alfred Ordway 1821–1897

Ruth Orkin 1921–1985

Chana Orloff 1888–1968

Gabriel Orozco b. 1962

José Clemente Orozco 1883–1949

Carlos Orozco Romero 1898–1984

Eric Orr 1939–1998

Joe Ortega b. 1965

Martín Rico y Ortega 1833–1908

George Ortman 1926–2015

Alphonse Osbert 1857–1939

Elizabeth Osborne b. 1936

John P. Osborne b. 1951

Jere Osgood b. 1936

Alfonso Ossorio 1916–1990

Thomas Ostenberg b. 1949

Carl Ostendarp b. 1961

David Ostrowski b. 1981

Abbo Ostrowsky 1889–1975

Sam Ostrowsky 1886–1946

Angelo Ostuni

Giuseppe Ostuni

Peter W. Ostuni 1908–1992

Arthur Osver 1912–2006

John Otar 1891–1939

Tom Otterness b. 1952

John E Otterson 1905–1991

Ouachita Pottery

J.J.P. Oud 1890–1963

Tony Oursler b. 1957

Paul Outerbridge 1896–1958

Hannah Overbeck 1870–1931

Overbeck Pottery

Elspeth Owen b. 1938

Robert Emmett Owen 1878–1957

Laura Owens b. 1970

Roman Owidzki 1912–2009

David Oxtoby b. 1938

Djordje Ozbolt b. 1967

Yigal Ozeri b. 1958

Auseklis Ozols b. 1941

Harold O’Connor b. 1941