- Source: John Barrett (dean of Clonmacnoise)
John Alan Gardiner Barrett (1929–1996) was Dean of Clonmacnoise from 1989 until 1996.
Barrett was educated at Trinity College, Dublin. He was ordained in 1959. After a curacy at Bray he held incumbencies at Enniskeen, Navan, and Rathdrum before his time as Dean.