Vexations is a musical work by Erik Satie. Apparently conceived for keyboard (although the single page of manuscript does not specify an instrument), it consists of a short theme in the bass whose four presentations are heard alternatingly unaccompanied and played with chords above. The theme and its accompanying chords are written using enharmonic notation. The piece is undated, but scholars usually assign a date around 1893–1894 on the basis of musical and biographical evidence.

The piece bears the inscription "In order to play the motif 840 times in succession, it would be advisable to prepare oneself beforehand, and in the deepest silence, by serious immobilities." ("Pour se jouer 840 fois de suite ce motif, il sera bon de se préparer au préalable, et dans le plus grand silence, par des immobilités sérieuses.") From the 1960s onward, this text has mostly been interpreted as an instruction that the page of music should be played 840 times, although this may not have been Satie's intention.