Jan Pieterszoon Sweelinck (/ˈjɑːn ˈpiːtərsoʊn ˈsweɪlɪŋk/; Deventer, April or May, 1562 – Amsterdam, 16 October 1621) was a Dutch composer, organist, and pedagogue whose work straddled the end of the Renaissance and beginning of the Baroque eras. He was among the first major keyboard composers of Europe, and his work as a teacher helped establish the north German organ tradition.