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 Meitetsu 3400 series electric multiple unit trains 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
See also
A3400 road in the UK