Sir Edward Elgar's Symphony No. 1 in A flat major, Op. 55 is one of his two completed symphonies. The first performance was given by the Hallé Orchestra conducted by Hans Richter in Manchester, England, on 3 December 1908.

It was widely known that Elgar had been planning a symphony for more than ten years, and the announcement that he had finally completed it aroused enormous interest. The critical reception was enthusiastic, and the public response unprecedented. The symphony achieved what The Musical Times described as "immediate and phenomenal success", with a hundred performances in Britain, continental Europe and America within just over a year of its première.

The work's main key is A flat major, rare for a symphony. It is scored for three flutes (one doubling piccolo), two oboes and cor anglais, two clarinets and bass clarinet, two bassoons and contrabassoon, four horns, three trumpets, three trombones, tuba, timpani, percussion (including snare drum, bass drum and cymbals), two harps, and strings.

It is in four movements:

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