Break-dance, breaking, b-boying is a street dance style that evolved as part of the hip hop movement among African American and Puerto Rican youths in Manhattan and the South Bronx of New York City during the early 1970s. It is normally danced to electro or hip hop music, often remixed to prolong the breaks, and is a well-known hip hop dance style. Break-dancing involves the dance elements of toprock, downrock, freezes, and power moves. A break-dancer, breaker, b-boy or b-girl refers to a person who practices break-dancing.

Break-dancing may have begun as a building, productive, and a constructive youth culture alternative to the violence of urban street gangs. Today, break-dancing culture is a discipline somewhere between those of dancers and athletes. Since acceptance and involvement centers on dance abilities, break-dancing culture is often free of the common race and gender boundaries of a subculture and has been accepted worldwide.