30, is a chamber-music composition by the Romanian composer George Enescu, written in 1943–44.

The score is dedicated to the memory of his composition teacher, Gabriel Fauré.

[1][2] The first performance of the work was given at the Library of Congress in Washington, DC, by the Albeneri Trio (Alexander Schneider, violin; Benar Heifetz, viola; Erich Itor Kahn, piano) with violist Milton Katims, on 31 October 1947, under the auspices of the Elizabeth Sprague Coolidge Foundation.

A rival contender for the premiere was a French radio broadcast performance by Yvonne Astruc, violin, Maurice Vieux, viola, Charles Bartsch, cello, with the composer at the piano, on 29 October, but almost certainly in 1948 rather than 1947.

Fragments or cells of this idea are found throughout, often transformed and integrated into the composition of other main themes.