The Piano Sonata No. 11 in A major, K. 331 / 300i, by Wolfgang Amadeus Mozart is a piano sonata in three movements. It is uncertain where and when Mozart composed the sonata; however, Vienna or Salzburg around 1783 is currently thought to be most likely (Paris and dates as far back as 1778 have also been suggested).
The sonata was published by Artaria in 1784, alongside Nos. 10 and 12 (K. 330 and K. 332).