A gaelcholáiste is a particular type of Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

 medium school in Ireland

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

 and Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

 at secondary level. They are characterised by being secondary Irish-medium schools outside the Gaeltacht

Gaeltacht

is the Irish language word meaning an Irish-speaking region. In Ireland, the Gaeltacht, or an Ghaeltacht, refers individually to any, or collectively to all, of the districts where the government recognises that the Irish language is the predominant language, that is, the vernacular spoken at home...

. Of the approximately 10,000 secondary students who do all their school subjects through Irish, approximately 6,000 attend a gaelcholáiste (including gaelcholáistí in Northern Ireland).