Earl of Arran is a title in the Peerage of Ireland. It is not to be confused with the title Earl of Arran in the Peerage of Scotland. The two titles refer to different places: the Aran Islands in Ireland, and the Isle of Arran in Scotland. The Irish earldom is held by the Gore family. The Scottish earldom is a separate title, held as a subsidiary title of the Duke of Hamilton.

The Peerage of Ireland consists of those titles of nobility created by the English monarchs in their capacity as Lord or King of Ireland, or later by monarchs of the United Kingdom of Great Britain and Ireland. It is one of the five divisions of Peerages in the United Kingdom. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are duke, marquess, earl, viscount and baron. As of 2016, there were 135 titles in the Peerage of Ireland extant: two dukedoms, ten marquessates, 43 earldoms, 28 viscountcies, and 52 baronies. However, these titles have no official recognition in the Republic of Ireland, with Article 40.2 of the Constitution of Ireland forbidding the state conferring titles of nobility and stating that an Irish citizen may not accept titles of nobility or honour except with the prior approval of the Irish government.