Artists starting with O
- O'Casey, Breon
- O'Connor, Elizabeth
- O'Connor, John
- O'Keeffe, Georgia
- Oldenburg, Claes
- Oliver, Vaughan
- Olsky
- O'Neill, Terry
- Opara, Eddie
- Opie, Julian
- Orpen, Sir William
- Orr RA, Chris
- Ortenstone, Nancy
- Osbjorn, Susan
- Osbourne, Richard
- Osslund, Helmer
- Owen, Clare