Irish Australians are an ethnic group of Australian citizens of Irish descent, which include immigrants from and descendants whose ancestry originates from the island of Ireland.

Australians, colloquially known as Aussies, are the citizens, nationals and individuals associated with the country of Australia. This connection may be residential, legal, historical or ethno-cultural. For most Australians, several of these connections exist and are collectively the source of their being Australian. Australian law does not provide for a racial or ethnic component of nationality, instead relying on citizenship as a legal status.