The Ulster Scots, also called Ulster Scots people or, in North America, Scotch-Irish (Scotch-Airisch) or Scots-Irish, are an ethnic group in Ireland who share a common history, culture, and ancestry. Some speak an Ulster Scots dialect of the Scots language, a West Germanic language. As an ethnicity, they descend largely from Scottish and English settlers who moved to the north of Ireland, during the 17th century.

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.