Piano Sonata No. 1

Piano Sonata No. 1 is the default title for a composers first (or only) piano sonata. It may refer to:
* Piano Sonata (Bartók), Sz. 80, by Béla Bartók
* Piano Sonata No. 1 (Beethoven), Op. 2, No. 1, by Ludwig van Beethoven
* Piano Sonata No. 1 (Boulez), 1946, by Pierre Boulez
* Piano Sonata No. 1 (Chopin), Op. 4, by Frédéric Chopin
* Piano Sonata (Grieg), Op. 7, by Edvard Grieg
* Piano Sonata (Liszt), S. 178, by Franz Liszt
* Piano Sonata No. 1 (Rachmaninoff), Op. 28, by Sergei Rachmaninoff
* Piano Sonata No. 1 (Scriabin), Op. 6, by Alexander Scriabin;or possibly
* 1. X. 1905 (also "Sonata"), by Leoš Janáček