8 mm

8 mm may refer to:

* 8mm (band)
* 8 mm film, or its replacement Super 8 mm film and Single-8 film
* "8mm" (film) – about a private detective trying to verify the authenticity of a snuff film.
* 8 mm video format – a type of video recorder and tape that is primarily used in camcorders, including Video 8 and Hi 8.
** Digital8
* Data8 – a tape drive and tape format used in backing up computer systems.
* Quarter Inch Cartridge – 0.315in/8 mm variant of QIC Quarter Inch tape
* 8 mm caliber, ammunition with bullet in the 8 mm (.315 in) caliber range
** 7.92x57 mm Mauser "8 mm Mauser cartridge" – a rifle cartridge invented by the Mauser company.