AC-4
# AC-4

AC-4 or AC4 may refer to:

## Music

* AC4 (band), a Swedish hardcore punk band, or their eponymous album

## Vehicles

### Aircraft

* Light Wing AC4, an aircraft
* Aviastroitel AC-4 Russia, glider
* Comte AC-4, a two-seat Swiss monoplane

### Ships

* USS Cyclops (AC-4), a US Navy collier ship

### Trains

* Southern Pacific class AC-4, a class of steam locomotive

### Tanks

* AC4 tank a World War Two Australian cruiser tank.

## Technology

* AC-4, an IEC Utilization Category
* Dolby AC-4, Dolby Digital audio codec

## Videogames

* Ace Combat 04: Shattered Skies, a 2001 video game
* Armored Core 4, a 2006 video game
* Assassin's Creed IV: Black Flag, a 2013 video game
