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Irish/British Artists
- O'BRIEN, Justin Maurice
- O'CONNOR, James Arthur
- O'CONNOR, Patrick
- O'CONNOR, Roderic(K)
- O'CONNOR, Victor George
- O'MALLEY, Tony
- O'NEILL, Daniel
- O'NEILL, George (Bernard)
- O'NEILL, George Bernard
- OAKES, John Wright
- OAKLEY, Octavius
- OAKMAN, John (Info Only)
- OGDEN, Olgierd
- OLERENSHAW, Bridget
- OLIVER, William
- OLIVER, William II
- OLLEY, Margaret Hannah
- OLSEN, John Henry
- OMER, Rowland (Info Only)
- ONWHYN, Thomas (Info Only)
- OPIE, John
- OPPENHEIMER, (Sir) Francis
- OPPENHEIMER, Charles
- OPPENHEIMER, Joseph
- ORCHARDSON, (Sir) William Quiller
- ORMSBY, Victor
- ORPEN, (Sir) William Newenham Montague
- ORR, Monroe Scott
- ORR, Richard (Info Only)
- ORVAN
- OSBORN, Emily Mary
- OSBORNE, Walter F.
- OSBOURNE, William
- OSOSKI, Gerald Judah
- OSPOVAT, Henry
- OSWALD, Charles W.
- OULESS, Philip John
- OULTON, Theresa
- OUTHWAITE, Ida Rentoul
- OWEN, George O.
- OWEN, Will (Info Only)
- OXENBURY, Helen (Info Only)
- OXENHAM, Patrick (Info Only)
- OYSTON, George
Artists' Signatures 
