Twelfth Year is an instrumental jazz tune composed by Django Reinhardt, with no lyricist. It is written in the gypsy jazz form and played in the swing quintet style, with violin and rhythm guitars. The original recording was made in Paris in March 1939 by Django Reinhardt and the Quintette du Hot Club de France, with Stéphane Grappelli on violin. Its first release was a 1939 78 rpm disc, coupled with Japanese Sandman.
The tune is written in D on the chart. It later became known mainly through reissue compilations, among them The Classic Early Recordings and the Chronological Classics series. The title also appears in the English list of compositions by Django Reinhardt.