AC-12

AC-12 may refer to:

Vehicles

 * Southern Pacific class AC-12, a 1940s American steam locomotive class
 * Comte AC-12 Moskito, a 1930s Swiss monoplane
 * Aerotécnica AC-12, a 1950s Spanish helicopter

Other uses

 * AC-12, an IEC utilization category in electrical engineering
 * AC-12, a fictional police anti-corruption unit in Line of Duty, a British television series