3400

3400 may refer to:

In general

 * A.D. 3400, a year in the 4th millennium CE
 * 3400 BC, a year in the 4th millennium BCE
 * 3400, a number in the 3000 (number) range

Products

 * IBM 3400 series
 * Nord 3400 aircraft
 * NS 3400 steam locomotives
 * NS Class 3400 diesel multiple unit trains
 * PowerBook 3400c laptop
 * Queensland Railways 3400 class electric locomotives

Other uses

 * 3400 Aotearoa, an asteroid in the Asteroid Belt, the 3400th asteroid registered
 * Hawaii Route 3400, a state highway
 * 3400 (District of Librazhd), one of the postal codes in Albania