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