Ástor Pantaleón Piazzolla (Spanish pronunciation: [piasola], Italian pronunciation: [pjattsɔlla]; March 11, 1921 – July 4, 1992) was an Argentine tango composer, bandoneon player and arranger. His oeuvre revolutionized the traditional tango into a new style termed nuevo tango, incorporating elements from jazz and classical music. A virtuoso bandoneonist, he regularly performed his own compositions with a variety of ensembles.

In 1992, American music critic Stephen Holden described Piazzolla as "the world's foremost composer of tango music".