Acoustic

Acoustic may refer to:

In science:
* Acoustics, a branch of physics that studies sound
** Musical acoustics, the branch of acoustics that studies the physics of music
* Acoustic meatus, another name for the ear canal
*Acoustic recording, a pre-microphone method of recording used, for instance, on the Graphophone

In music:
* Acoustic music, music that solely or primarily uses acoustic instruments
* An instrument used in acoustic music (see link above), such as:
** Acoustic guitar, as opposed to electric guitar
** Acoustic bass guitar, as opposed to electric bass guitar
* An album:
** "Acoustic" (Deine Lakaien album), 1995
** "Acoustic" (John Lennon album), 2004
* A record label:
** Acoustic Disc
* Piano acoustics
* Acoustic fingerprint

Warfare
* Acoustic torpedo
* Acoustic signature

Other:
* Acoustic Control Corporation, a company which produced instrument amplifiers using "Acoustic" as a brand name
* Acoustic thermometry, observation of the oceans' climates using long-range acoustic instruments
* Acoustic cryptanalysis, in cryptography, a side channel attack which exploits sounds