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300 artists on this page, with their dates and recorded works.
- monogramistul P. O.
- Dermod O'Brien
- George O'Brien
- John O'Brien
- James Arthur O'Connor
- John J. O'Connor
- John Scorror O'Connor
- Thom O'Connor
- Roderic O'Conor
- Eric O'Dea
- Shaun O'Dell
- Hugh O'Donnell
- Juan O'Gorman
- Harriet Osborne O'Hagan
- Frederick O'Hara
- Pablo O'Higgins
- Alfred Henry O'Keeffe
- Georgia O'Keeffe
- Ida O'Keeffe
- Aloysius O'Kelly
- Henry Nelson O'Neil
- O'Neill
- Amy O'Neill
- George Bernard O'Neill
- Hugh O'Neill
- Joseph O'Reilly
- Montagu Frederick O'Reilly
- Timothy H. O'Sullivan
- Richard Banner Oakeley
- John Wright Oakes
- Trevor Oakes Ryan Oakes
- Oakley
- Alfred James Oakley
- Octavius Oakley
- Violet Oakley
- Nicolae Oancea
- Oscar Obedeanu
- Mary Obering
- Anthony Oberman
- Adolf Obermüllner
- George Oberteuffer
- Mikołaj Obilman
- Philomé Obin
- Pedro de Obregón
- Roberto Obregón
- Jakub Obrovský
- Jose Maria Montes de Oca
- Isidoro Ocampo
- Miguel Ocampo
- Tetsuo Ochikubo
- Federico de Madrazo y Ochoa
- Jacob Ochtervelt
- Giovanni Odazzi
- Willem van Odekercken
- Marcel Odenbach
- Joseph-Denis Odevaere
- Édouard Alexandre Odier
- Michel Odieuvre
- Odle
- Toyin Ojih Odutola
- Anton Oechs
- Albert Oehlen
- Rainald Goetz Albert Oehlen
- Ernst Erwin Oehme
- Ernst Ferdinand Oehme
- Nicolaus Oeller
- Richard Oelze
- Clara Wilhelmine Oenicke
- Frans Oerder
- Hans Jakob Oeri
- Johannes Adam Simon Oertel
- Adam Friedrich Oeser
- Wilhelm Oesterle
- Carl Oesterley
- Hendrick ten Oever
- of Eldin, John Clerk
- Reporter Printing Office
- The Theatre Royal Printing Office
- Thomas Story Officer
- Chris Ofili
- J. Ogborne
- Simon Ogden
- Frederick Forbes Ogilvie
- Stelian Ogrezeanu
- Daniel Ohene-Adu
- Jeppe Madsen Ohlsen
- Tomie Ohtake
- Michail Oikonomou
- Hélio Oiticica
- Naúl Ojeda
- Kenzo Okada
- Shuki Okamoto
- Toshiko Okanoue
- Uche Okeke
- Samuel Okey
- Ryszard Okniński
- olar
- Genaro Rodríguez Olavide
- Alexander Olbricht
- Joos of Momper (I) the Old
- Claes Oldenburg
- Coosje van Bruggen Claes Oldenburg
- John Edwin Oldfield
- Elizabeth Olds
- Auguste Oleffe
- Józef Oleszkiewicz
- Verykaki Olga
- Jacobus Oliphant
- Jan Olis
- Jules Olitski
- Francisco Fernández de la Oliva
- Jean-Baptiste Olive
- Nathan Oliveira
- Alfred Oliver
- Emma Sophia Oliver
- Isaac Oliver
- Isaac Oliver
- Peter Oliver
- William Oliver
- Xiomara De Oliver
- Alessandro Oliverio
- Master of the Dutuit Mount of Olives
- Master of Monte Oliveto
- Ferdinand Olivier
- Friedrich Olivier
- Francisco Manuel Oller
- Yrjö Ollila
- Michel-Barthélémy Ollivier
- Wenzel von Olmutz
- Lucy McKenzie Paulina Olowska
- Paulina Olowska
- Henrik Olrik
- Peter Olsen-Ventegodt
- Hiroshi Omae
- Balthasar Paul Ommeganck
- Yoko Omomi
- Koshiro Onchi
- Julian Onderdonk
- Jan Onghers
- Toni Onley
- Harm Kamerlingh Onnes
- Menso Kamerlingh Onnes
- John Lennon Yoko Ono
- Yoko Ono
- Mihai Onofrei
- Crescenzio Onofri
- Crescenzio di Onofrio
- Norberto Onofrio
- Søren Onsager
- F. Onwhyn
- Jacob van Oolen
- Karel Ooms
- Jacob van Oost
- Izaak van Oosten
- Dirk van Oosterhoudt
- Jacob Cornelisz. van Oostsanen
- Roman Opalka
- Rodolfo Opazo
- David Opdyke
- John Opie
- Julian Opie
- Roy Opie
- Ferdinand Opitz
- Georg Emanuel Opiz
- Dennis Oppenheim
- Meret Oppenheim
- Moritz Daniel Oppenheim
- Sheryl Oppenheim
- Max Oppenheimer
- Gilles Marie Oppenord
- John Opper
- Jan Pietersz Opperdoes
- Alexander Oppler
- Constantin Oprea
- Simon Opzoomer
- Edward Oram
- William Oram
- Renato Orara
- Orcagna
- William Quiller Orchardson
- Orde
- Marcel Ordinaire
- Manuel José de Laredo y Ordoño
- Alfred Ordway
- Angel Orensanz
- Joseph Orient
- L'Estampe Originale
- Irune Oriñuela
- Pietro di Francesco degli Orioli
- Deodato Orlandi
- Jan Orlandi
- Felipe Orlando
- Bernard Van Orley
- Jan van Orley
- Richard van Orley
- Valentijn van Orley
- Emil Orlik
- Chana Orloff
- Vladimir Orloffskij
- Pimen Orlov
- Aleksandr Osipovich Orlovskii
- Vladimir Orlovsky
- Edith Orlowski-Balogh
- Aleksander Orłowski
- Łukasz Orłowski
- Daniel Orme
- David Orme
- Edward Orme
- William Orme
- Willem Ormea
- Teo Ormond-Skeaping
- Gabriel Orozco
- José Clemente Orozco
- William Orpen
- William Newenham Montague Orpen
- Orphan
- Chris Orr
- Christopher Orr
- Louis Orr
- Pedro Orrente
- Orrock
- James Orrock
- Hippolyte de Bourg d' Orschwillier
- Victor Orsel
- Bernardino Orsi
- Lelio Orsi
- Tranquillo Orsi
- Antonio Orsini
- Calixto Ortega
- Damián Ortega
- Francisco Ortego
- Gloria Ortiz-Hernández
- Rubén Ortiz-Torres
- Adela Ginés y Ortiz
- Emilio Ortiz
- Francisco Pradilla y Ortiz
- Manuel Angeles Ortiz
- George Ortman
- Ortolano
- Pasqual Ortoneda
- Erik Ortvad
- George Jacobus Johannes van Os
- Georgius Jacobus Johannes van Os
- Jan van Os
- Maria Margaretha van Os
- Pieter Gerardus van Os
- Pim van Os
- Joseph Osbach
- Alphonse Osbert
- Emily Mary Osborn
- Sally Osborn
- Malcolm Osborne
- Walter Osborne
- William Osborne
- Charles Osgood
- Master of Osma
- Francisco de Osona
- Rodrigo de Osona
- Roberto Ossaye
- Jan van Ossenbeeck
- Willem Ossenbeeck
- Jan Josias Ossenbeek
- Master of the Osservanza
- Helmer Osslund
- Alfonso Ossorio
- Isaac van Ostade
- Michael Ostendorfer
- Ilya Ostroukhov
- Fayga Ostrower
- Arthur Osver
- Meister der Oswaldlegende
- Ottilia Oteleșanu-Michail
- Alejandro Otero
- Jean-Michel Othoniel
- Bass Otis
- Johann Otmar
- Ryszard K. Otreba
- A.M. Ott
- Lucien Ott
- Jacobus Hermanus Otterbeek
- Tom Otterness
- O.D. Ottesen
- William Young Ottley
- Silke Otto-Knapp
- Jan Jansz. Westerbaen de Oude
- Adriaen Oudendijck
- Johannes Dircksz van Oudenrogge
- Pieter Van der Ouderaa
- Jean-Baptiste Oudry
- Anastasiadou Ourania
- Stathopoulou Ourania
- Tony Oursler
- Paul Outerbridge
- Jean Jacques Outhwaite
- Pierre-Justin Ouvrié
- Jean Ouvrier
- Albert van Ouwater
- Isaac Ouwater
- Jürgen Ovens
- Johann Friedrich Overbeck