Artist Archive
- O Broin, Liam (b.1944)
- O Cólmáin, Séamus (1925-1990)
- O'Boyle, Eamonn (b.1976)
- O'Breartuin, Pat
- O'Brien, Dermod PRHA HRA HRBA HRSA (1865-1945)
- O'Brien, Dermod PPRHA (1845-1945)
- O'Brien, Elizabeth
- O'Brien, Geraldine (1922-2014)
- O'Brien, Gretta (1933-2017)
- O'Brien, John
- O'Brien, Kitty Wilmer RHA PWCSI (1910-1982)
- O'Brien, Kitty Wilmer RHA (1901-1982)
- O'Brien, Senan (b.1964)
- O'Byrne, Mairead
- O'Callaghan, A.
- O'Callaghan-Westropp, Rosemary (1896-1982)
- O'Casey, Breon (1928-2011)
- O'Casey, Seán (1880-1964)
- O'Ceallacain, Diarmuid ANCA (1915-1993)
- O'Ceallacháin, Eamonn 20th - 21st Century
- O'Ciobhaín, Bláithín (b. 1935)
- O'Colmáin, Séamus (1915-1990)
- O'Connell, Eilis (b.1953)
- O'Connell, Eilis ARHA (b.1953)
- O'Connell, Seán (1909-1992)
- O'Connor, B. (circa 1940s-50s)
- O'Connor, Declan (b.1957)
- O'Connor, Eimear (b.1965)
- O'Connor, Eóin (b.1973)
- O'Connor, James (b.1945)
- O'Connor, James Arthur (1792-1841)
- O'Connor, John ARHA RI (1830-1889)
- O'Connor, Joseph (b.1936)
- O'Connor, Patrick (1909-1997)
- O'Connor, Peter 'Metcalfe'
- O'Connor, Sean (1909-1992)
- O'Connor, Seán (1909-1992)
- O'Conor, Renée (neé Honta) (1894-1955)
- O'Conor, Roderic (1860-1940)
- O'Dea, Frank
- O'Dea, Michael PPRHA (b.1958)
- O'Doherty, David (b.1935)
- O'Doherty, Eamonn (1939-2011)
- O'Donnell, Deirdre
- O'Donnell, Henry C. (1900-1992)
- O'Donnell, Ruth (b.1952)
- O'Donnell, Simon (b.1945)
- O'Donoghue, Hughie RA (b.1953)
- O'Donoghue, John b.1930
- O'Donohoe, Francis J. ARHA (1878-1911)
- O'Dowd, Gwen (b.1957)
- O'Flanagan, James Roderick
- O'Grady, Standish (1848-1928)
- O'Halloran, James (b.1955)
- O'Halloran, Robbie (b.1975)
- O'Hara, Helen (1846-1920)
- O'hEocha, Mairead (b. 1962)
- O'Kane, David (b.1985)
- O'Kane, Eamon (b. 1974)
- O'Kane, Eamon (b.1974)
- O'Kane, Elizabeth (b.1970)
- O'Keefe, Frank
- O'Keefe, Noelle (b.1962)
- O'Kelly, Aloysius C. (1853-1936)
- O'Klein, Boris (Russian/French, 1893-1985)
- O'Leary, Cormac (b.1969)
- O'Leary, Helen (b. 1961)
- O'Leary, John (1929-1999)
- O'Malley, Jane (1944-2023)
- O'Malley, Jane (b.1944)
- O'Malley, Michael Augustin Power (1870-1946)
- O'Malley, Tony HRHA (1913-2003)
- O'Malley, Tony HRHA (1913-2003) and others
- O'Meara, Richard (b.1946)
- O'Murnaghan, Art (1875-1953)
- O'Neill, Daniel (1920-1974)
- O'Neill, Gay
- O'Neill, Geraldine (b.1971)
- O'Neill, Henry (1798-1880)
- O'Neill, Liam (b.1954)
- O'Neill, Mark (b.1963)
- O'Neill, Michael (b.1930)
- O'Neill, Niall (b.1952)
- O'Neill, Thaddeus
- O'Neill, W. A. J.
- O'Neill Gallagher, Frederick (fl.1906-1917)
- O'Regan, Anne (b.1959)
- O'Reilly, Patrick (b.1957)
- O'Reilly, Rosemary
- O'Rourke, Patrick
- O'Ryan, Fergus RHA (1911-1989)
- O'Shea, H. (fl.1900s)
- O'Sullivan, Donal (1945-1991)
- O'Sullivan, Lilian
- O'Sullivan, Michael (b.1945)
- O'Sullivan, Patrick (b.1940)
- O'Sullivan, Patrick (1940-2015)
- O'Sullivan, Seán RHA (1906-1964)
- O'Toole, Francis
- O'Toole, Lawrence (b. 1968)
- O’Brien, Gretta (1933-2017)
- O’Kelly, Aloysius C. (1853-1936)
- O’Neill, Daniel (1920-1974)
- O’Neill, Daniel (1920-1974) and Gerard Dillon (1916-1971)
- O’Neill, Liam (b.1954)
- Oakley, Charles (1925-2008)
- Oakley, Charles (b.1925)
- Oakley, George
- Obamanskhin, M. F. (b.1962)
- Ochs, John (American, b. 1969)
- Odell, Mary (c.1903-1976)
- Ogden, Perry (b.1961)
- Oldenburg, Claes (Swedish-American, 1929-2022)
- Oldenburg, Klaus (b.1942)
- Oliver, William (1823-1901)
- Olverson, Vicki (b.1956)
- Omoiade, Remi
- Opffer, Ivan (1897-1980)
- Opie, Julian (b.1958)
- Orme Shaw, Dennis (b.1944)
- Orpen, Bea HRHA (1913-1980)
- Orpen, Richard Caulfield RHA (1863-1938)
- Orpen, Sir William KBE RA RI RHA (1878-1931)
- Osborn, Raymond (d. 2024)
- Osborne, Danny (b. 1949)
- Osborne, Danny (b.1949)
- Osborne, Dennis Henry RUA (1919-2016)
- Osborne, James (1940-1992)
- Osborne, Jean (1926-1965)
- Osborne, Walter Frederick RHA ROI (1859-1903)
- Osborne, William RHA (1823-1901)
- Osborne Campbell, Annie (b.1889)
- Ospovat, Henry (British, 1877-1909)
- Ossory Dunlop, Ronald RA RBA NEAC (1894-1973)
- Ovenden, Rev. Charles Thomas (1846-1924)
- Overend, David Anthony (b.1932)
- Overy, Richard