Irish nobility refers to persons who fall into one or more of the following categories of nobility.

1. Gaelic nobility of Ireland are those who qualified under the rules of tanistry, or otherwise were or are descendants in the male line of at least one historical grade of king (Rí). This group includes the descendants of the Norse-Gaelic kings as well. The article for this branch of nobility sets out the degrees of kingship and the trappings of kingship in Gaelic Ireland.
2. Hiberno-Norman or Old English (Ireland) nobility who were the descendants of the settlers who came to Ireland from Wales, Normandy and England after the Norman invasion of Ireland in 1169–71.
3. Peerage of Ireland who owe their tities to those created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland.