Irish dancing or Irish dance is a group of traditional dance forms originating in Ireland which can broadly be divided into social dance and performance dances. Irish social dances can be divided further into céilí and set dancing. Irish set dances are quadrilles, danced by 4 couples arranged in a square, while céilí dances are danced by varied formations (ceili) of 2 to 16 people. In addition to their formation, there are significant stylistic differences between these two forms of social dance. Irish social dance is a living tradition, and variations in particular dances are found across the Irish dancing community; in some places, dances are deliberately modified and new dances are choreographed.

Irish dancing, popularised in 1994 by the world-famous show "Riverdance", is notable for its rapid leg and foot movements, body and arms being kept largely stationary.

Most competitive dances are solo dances, though many stepdancers also perform and compete using céilí dances. The solo stepdance is generally characterised by a controlled but not rigid upper body, straight arms, and quick, precise movements of the feet. The solo dances can either be in "soft shoe" or hard shoe".

The dancing traditions of Ireland probably grew in close association with traditional Irish music. Although its origins are unclear, Irish dancing was later influenced by dance forms from the Continent, especially the Quadrille. Travelling dancing masters taught all over Ireland, as late as the early 1900s.