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- O'CONNOR, John Scorror
- O'DELL, Michael
- O'GORMAN, Mollie
- O'KEEFFE, Sian
- O'MALLEY, Joan
- O'SHEA, Martin
- O'TOOLE, Joyce
- OAKES, John Beauchamp
- OAKES, Mary Margaret
- OAKLEY, Ann
- ODAM, George Stanley
- OELMAN, Michael
- OFFORD, Thomas Grimwood
- OGHENEGWEKE, Helen
- OLD DAIRY STUDIOS
- OLD FIRE ENGINE HOUSE GALLERY
- OLD JET ARTS CENTRE
- OLD PRINT WORKS GALLERY
- OLDHAM, Arthur Frederic
- OLIVER, Basil
- OLIVER, Benjamin
- OLIVER, Emma Sophia
- OLIVER, Gabrielle Cornelia
- OLIVER, Gwendolen
- OLIVER, Herbert Benjamin
- OLIVER, Jessica
- OLIVER, Ken
- OLIVER, William
- OLLERENSHAW, Neville Finnemore
- OLLERENSHAW, Nony
- OLLINGTON, Robin
- ONE O ONE GALLERY
- OPEN COLLEGE OF THE ARTS
- OPEN EYE GALLERY
- ORDE, Cuthbert Julian
- ORGILL, Robert
- ORRISS, Brian
- ORTON, Moira
- ORWELL ART CLUB
- ORWELL DECORATIVE AND FINE ARTS SOCIETY
- OSBORNE, Alexander Luke
- OSBORNE, Douglas Cyril
- OSBORNE, Malcolm
- OSBORNE, Trevor Walter
- OSHELDA, Anne-Marie
- OSLER, Anthony
- OSMOND, Edward
- OTHER ART FAIR
- OTTEWILL ART GALLERY
- OTTLEY, Peggy
- OULTON BROAD ART CIRCLE
- OUTEN, Cathy
- OUTPOST GALLERY
- OVEL, Christine Anne
- OVERBURY, Charles Edward
- OVERTON, Dorothea Gertrude
- OVEY, Margaret Beatrice
- OWEN, Annie
- OWEN, George Elmslie
- OXBORROW, Asher
- OXBORROW, Edmund
- OXBORROW, Ernest Ralph
- OXENBURY, Helen
- OXENBURY, Thomas Bernard
- OXFORD SCHOOL OF ART
- OXMARKET GALLERY