Skip to main content - O'Callaghan, Kathleen (1888–1961)
- O'Carroll, Maureen (1913–1984)
- O'Casey, Eileen (1900–1995)
- O'Connell, Eileen (c. 1743–c. 1800)
- O'Connell, Helen (1920–1993)
- O'Connell, Mary (1814–1897)
- O'Connell, Patricia (d. 1975)
- O'Connell, Sarah (c. 1822–1870)
- O'Connor, Colleen
- O'Connor, Ellen (1857–1933)
- O'Connor, Flannery (1925–1964)
- O'Connor, Karen (1958–)
- O'Connor, Kathleen (1935–)
- O'Connor, Mary Anne (1953–)
- O'Connor, Sandra Day (1930–)
- O'Connor, Sinéad (1966–)
- O'Connor, Una (1880–1959)
- O'Day, Anita (1919–)
- O'Day, Caroline (1869–1943)
- O'Day, Molly (1911–1998)
