In Irish mythology, Ériu (Irish pronunciation: [ˈeːrʲu]; modern Irish Éire), daughter of Ernmas of the Tuatha Dé Danann, was the eponymous matron goddess of Ireland. Her husband was Mac Gréine (‘Son of the Sun’).

The English name for Ireland comes from the name Ériu and the Germanic (Old Norse or Old English) word land.

The fact that Ériu is represented as goddess of Ireland, she is often interpreted as a modern day personification of Ireland, although since the name "Ériu" is the older Irish form of the word Ireland, her modern name is often modified to "Éire" or "Erin" to suit a modern form.

With her sisters, Banba and Fódla, she was part of an important triumvirate of goddesses. When the Milesians arrived from Galicia each of the three sisters asked that her name be given to the country. This was granted to them, although Ériu (Éire) became the chief name in use (Banba and Fódla are still sometimes used as poetic names for Ireland, much as Albion is for Great Britain).

Ériu, Banba and Fódla are interpreted as goddesses of sovereignty.