Ulster Scots or Ulster-Scots, also known as Ulster Scotch and Ullans, is the dialect of Scots spoken in parts of Ulster in Northern Ireland and the Republic of Ireland. It is generally considered a dialect or group of dialects of Scots, although groups such as the Ulster-Scots Language Society and Ulster-Scots Academy consider it a language in its own right, and the Ulster-Scots Agency and former Department of Culture, Arts and Leisure have used the term Ulster-Scots 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.