3040 may refer to:
3040, a number in the 3000 (number) range A.D. 3040, a year of the 4th millennium CE 3040 BC, a year in the 4th millennium BCE
Roads numbered 3040 Hawaii Route 3040, a state highway Louisiana Highway 3040, a state highway Texas Farm to Market Road 3040, a state highway A3040 road (Great Britain)
Other uses 3040 Kozai, a near-Mars asteroid, the 3040th asteroid registered Commodore 3040, a floppy drive unit 3040th Aircraft Storage Group of the U.S. Air Force
See also
, a WWII Kriegsmarine submarine