Una O'Hagan (born 1962) is an Irish author, journalist and former newsreader with Raidió Teilifís Éireann (RTÉ), Ireland's national radio and television station. She presented the main television news programmes Six One News, Nine O'Clock News and One O'Clock News including all other news bulletins on both radio and television. For nine years, from 1996 to 2005, she co-presented the station's flagship news programme Six One News with Bryan Dobson. O'Hagan presented her last news bulletin on Sunday 25 February 2018.