Pol O Muiri was born in Belfast in 1965 and educated at Saint Mary's Christian Brothers' Grammer School and Queen's University, Belfast, where he was awarded a BA (Hons) in Celtic Studies and Scholastic Philosophy and a PhD in Celtic Studies. In 1991, he was given the Sam Hanna Bell Fellowship in Literature from the Cultural Traditions Group.
O Muiri primarily writes in the medium of the Irish language but has also written poetry, short fiction and literary biography in English. As a poet, he has produced two volumes in English: D-Day (1995) and Cold War (2009). His novella Milltown appeared in 2007. He has also penned a biography of the Donegal Irish language writer Seosamh Mac Grianna, A Flight from Shadow: The Life & Works of Seosamh Mac Grianna. (1999). This was later issued in Irish: Seosamh Mac Grianna: Míreanna Saoil (20070>
In Irish he has produced several collections of poetry including: Faoi Scáil na Ríona (1991), Dinnseanchas (1992), Ginealach Ultach (1993), Siosafas: Gearrscéalta (1995), Abhar Filíochta (1995), Is Mise Ísmeáél (2000), Na Móinteacha (2004).
He has written also written a novel and a collection of short stories in Irish: Dlithe an Nádúir (2001, winner of Oireachtas na Gaeilge literary award) and Snagcheol (2002).
He has also written novels for adult learners of Irish and has had several plays broadcast on RTE radio.
A journalist by profession, he is currently Irish language editor of the Irish Times.