Launy Grøndahl (30 June 1886 – 21 January 1960) was a Danish composer and conductor.
Grøndahl studied the violin from the age of eight.
His first work as a professional musician was as a violinist with the Orchestra of the Casino Theatre in Copenhagen, aged thirteen.He was also for a long period (1925–1956) the resident conductor of the Danish National Symphony Orchestra, Denmark's most prestigious orchestra.