Patrick Bonaventure Geoghegan, O.F.M. (1805–1864) was an Irish Roman Catholic clergyman who served firstly as Bishop of Adelaide. Born in Dublin, he became a Franciscan friar and served at a Dublin parish before volunteering for Australia. After five years as Bishop of Adelaide, He returned to Ireland, intending to stay only briefly. He was named Bishop of Goulburn, Australia, but died before he could assume the post.