Subsonic

Subsonic may refer to:

Motion through a medium

 * Any speed lower than the speed of sound within a sound-propagating medium
 * Subsonic aircraft, a flying machine that flies at air speeds lower than the speed of sound
 * Subsonic ammunition, a type of bullet designed to avoid creating a loud shockwave when fired
 * Subsonic flight, an aircraft flight at air speeds lower than the speed of sound in air
 * Subsonic and transonic wind tunnels

Music

 * Subsonic (album), a 2002 album by Vigleik Storaas Trio
 * Subsonic (EP), a 2013 EP by Younha
 * Subsonic album series:
 * Subsonic 2: Bass Terror, a 1995 album by Bill Laswell and Nicholas Bullen
 * Subsonic 3: Skinner's Black Laboratories, a 1995 album by Andy Hawkins and Justin Broadrick
 * Subsonic Music Festival, an annual electronic music festival in Monkerai, Australia