The Symphony No. 4, Op. 49, is an orchestral composition by the Finnish composer Aulis Sallinen, who wrote the piece from 1978–79 for a commission from the City of Turku, to celebrate its 750th anniversary. The Turku Philharmonic Orchestra premiered the work on 9 August 1979, under the direction of its principal conductor, Pertti Pekkanen.

This article includes a list of general references, but it lacks sufficient corresponding inline citations. (November 2018)

The symphony is in three movements:

According to the publisher, Novello & Co, Symphony No. 4 is scored for the following:

• Woodwind: 3 flutes (2 doubling piccolo), 3 oboes, 3 clarinets in B♭ (1 doubling B♭ bass clarinet), 3 bassoons (1 doubling contrabassoon)
• Brass: 4 horns in F, 3 trumpets in B♭, 3 trombones, 1 tuba
• Percussion: timpani, 3 percussionists (individual instruments?)
• Strings: violins, violas, cellos, double basses, harp, celesta

To date, Symphony No. 4 has received three recordings, the first of which is from 1984 with Okko Kamu conducting the Helsinki Philharmonic on the Finlandia label. Finnish conductor Ari Rasilainen has also recorded the symphony as part of cpo's compendium of Sallinen's orchestral works. The Fourth Symphony joins the Second (Op. 29, 1972), the Horn Concerto (Op. 82, 2002), and Mauermusik (Op. 7, 1963) on the third volume of the cpo series.