The Vision of Adamnán or Adamnán's Vision, also spelled Adomnán, in Irish Fís Adamnáin (or Adomnáin), is a work of visionary literature written in Middle Irish in two parts, the first dating to the 11th century and the second the early 10th. It has sometimes been dated as early as the 8th or 9th century. Its authorship is unknown. The third-person narrative describes a vision of heaven and hell attributed to Adamnán (d. 704 AD), abbot of Hy and Iona, and primary biographer of Saint Columba.
The Vision of Adamnán appears in The Book of the Dun Cow and the Speckled Book, both held by the Royal Irish Academy, and two additional manuscripts. About 5,000 words long, it was influenced by the Apocalypse of the Seven Heavens, the Vision of Paul, and writings by Gregory the Great. It is the earliest Irish visionary work to use the literary device of a bridge that souls must cross as part of a sorting ordeal, and marks the origin of visionary literature about the trials of the spiritual pilgrim in the Irish tradition.The Vision of Adamnán influenced the Hiberno-Latin Vision of Tundale, which was widely disseminated in various languages, and was a precursor to the Divine Comedy of Dante in describing a tripartite otherworld through which the pilgrim is escorted by a spiritual guide.