Jack Mathieu Émile Lang (born 2 September 1939) is a French politician. A member of the Socialist Party, he served as Minister of Culture from 1981 to 1986 and again from 1988 to 1993, as well as Minister of National Education from 1992 to 1993 and 2000 to 2002.

He was also Mayor of Blois from 1989 until his resignation in 2000. Lang is best known for originating the Fête de la Musique in 1982 as Culture Minister, an all day public music festival which occurs yearly on 21 June in France and throughout the world. Since 2013 he has been president of the Arab World Institute in Paris.