Martinů composed his Third Symphony during a summer retreat in Ridgefield, Connecticut from 2 May to 14 June 1944. The composition was not the result of a commission, but rather was a spontaneous gesture, and is dedicated to Serge Koussevitzky and the Boston Symphony Orchestra, on the twentieth anniversary of their association. It was premiered in Boston, Massachusetts on 12 October 1945 by the dedicatees (Crump 2010, 237–38).

Date of composition 1944 (from May 2 to June 14) in Ridgefield, CT, United States
Premiered 1945, October 12th in Boston, MA, United States by Serge Koussevitzky
Dedicated to Serge Koussevitzky
Dedicated to and the Boston Symphony Orchestra
Type Symphony
Tonality E-flat Minor
Catalogue H 299
Instruments Orchestra
Autotranslations beta Bohuslav Martinů: Symphonie n°3 en mi bémol mineur, H 299
Bohuslav Martinů: Sinfonia n. 3 in mi bemolle minore, H 299
Bohuslav Martinů: Sinfonie Nr. 3 es-moll, H 299