A Gaeltacht is a district of Ireland, either individually or collectively, where the Irish government recognises that the Irish language is the predominant vernacular, or language of the home. The Gaeltacht districts were first officially recognised during the 1920s in the early years of the Irish Free State, following the Gaelic revival, as part of a government policy aimed at restoring the Irish language.

Irish, also known as Irish Gaelic or simply Gaelic, is a Goidelic language of the Insular Celtic branch of the Celtic language group, which is a part of the Indo-European language family. Irish is indigenous to the island of Ireland and was the population's first language until the 19th century, when English gradually became dominant, particularly in the last decades of the century. Today, Irish is still commonly spoken as a first language in areas of Ireland collectively known as the Gaeltacht, in which only 2% of Ireland's population lived in 2022.