2A3

2A3 may refer to:


 * 2A3 Kondensator 2P, a Soviet self-propelled Howitzer
 * Larsen Bay Airport, Alaska — FAA LID code: 2A3
 * Bessemer Airport, Alabama — former FAA LID code: 2A3
 * a Power triode commonly used in Single-ended triode (SET) amplifiers