céilidh

thumb|upright=1.5|A dance in Alexandria, Virginia, United States A ' ( , ) or ' () is a traditional Scottish and Irish social gathering. In its most basic form, it simply means a social visit. In contemporary usage, it usually involves dancing and playing Gaelic folk music, either at a home or a larger concert at a social hall or other community gathering place.

(plural of ) and (plural of ) originated in the Gaelic areas of Scotland and Ireland and are consequently common in the Scottish and Irish diasporas. They are similar to the traditions in Cornwall and and events in Wales, merry neets in Cumbria and North East England, as well as English country dance throughout England which have in some areas undergone a fusion with céilithe.