O - Sorted alphabetically

James Arthur O'Connor	Frank O'Meara	Henry Nelson O'Neil	George Bernard O'Neill
John Wright Oakes	Emmanuel Oberhausen	Amelie-Pauline Oberlin	Anthony Oberman
Mikolaj Obilman	Raphael De Ochoa y Madrazo	Order custom, handmade oil paintings on canvas from www.1st-art-gallery.com!	Jacob Ochtervelt
Mina Fonda Ochtman	Walter Mason Oddie	Frans Wilhelm Odelmark	Joseph-Denis Odevaere
Ernst Ferdinand Oehme	Hugo Oehmichen	Johannes Adam Simon Oertel	Karl August Heinrich Ferdinand Oesterley
Master Of The Playing Cards	Marco d' Oggiono	Order custom, handmade oil paintings on canvas from www.1st-art-gallery.com!	John Clinton Ogilvie
Ryszard Okninski	Edward Okun	Ignacio Diaz Olano	Master of the Older Holy Kinship Altar
Jozef (Joseph) Oleszkiewicz	Order custom, handmade oil paintings on canvas from www.1st-art-gallery.com!	Franciszek Ksawery Olexinski (Oleksinski)	Jean-Baptiste Olive
Isaac Oliver	Leon Olivie-Bon	Johann Heinrich Ferdinand Olivier	Pier Paolo Olivieri
Michel-Barthelemy Ollivier	Jan Kazimierz Olpinski	Ole Henrik Olrik	Giovanni Antonio Omodeo
Julian Onderdonk	Order custom, handmade oil paintings on canvas from www.1st-art-gallery.com!	Hendrik Van Oort	Jacob van, the Elder Oost
Maria van Oosterwijk	Jacob Cornelisz Van Oostsanen	George Willem Opdenhoff	John Opie
George Emmanuel Opitz	Sandra Oppegard	Willem Johannes Oppenoorth	Andrea Orcagna