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
See also
- Infrasound, sound at frequencies below the normal threshold of human hearing