Skip to main content - O'Donnell, Pierce 1947–
- O'Donnell, Roseann 1962- (Rosie O'Donnell)
- O'Donnell, Sunshine 1971(?)-
- O'Donovan, Oliver 1945- (Oliver Michael Timothy O'Donovan)
- O'Dwyer, Starbuck (Jeffrey Starbuck O'Dwyer)
- O'Dwyer, Tess 1966-
- O'Faolain, Nuala 1940-
- O'Faolain, Nuala 1940-
- O'Faolain, Nuala 1940–2008
- O'Farrell, John
- O'Farrell, Maggie 1972-
- O'Farrell, Maggie 1972–
- O'Farrell, Mary Ann
- O'Flynn, Criostoir 1927–
- O'Gallagher, Liam 1917-2007 (William Gallagher)
- O'Gorman, James F(rancis) 1933-
- O'Grady, Jean (Mary) 1943-
- O'Grady, Paul 1964-
- O'Grady, Tom 1943-
- O'Hagan, Andrew 1968–
