Onset

Onset may refer to:


 * Onset (audio), the beginning of a musical note or sound
 * Onset, Massachusetts, village in the United States
 * Onset Island (Massachusetts), a small island located at the western end of the Cape Cod Canal
 * Interonset interval, a term in music
 * Syllable onset, a term in phonetics and phonology
 * The Onset, Liverpool indie rock group formed by Mike Badger of the La's
 * The Onset (album), a 2005 album by the band
 * USS Onset (SP-1224), a United States Navy patrol boat in commission from 1917 to 1918
 * "Onset", a 2019 song by Haiku Hands