Dúnán (died 6 May 1074) was the first bishop of Dublin, appointed under Dublin’s Hiberno-Norse kings. He is known also as Donatus or Donat.

The diocese was put on a regular basis, in 1028, at the request of Sigtrygg Silkbeard. In his obit in the Annals of Ulster Dúnán is described as “chief bishop of the foreigners” (ardespoc Gall)