The Keisei 3700 series (京成3700形) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Keisei Electric Railway in the Tokyo area of Japan since 1991.

[2] As of November 2014[update], the six-car sets are used solely on the Keisei Main Line.

The sets are formed as follows,[5] with car 1 at the Narita Airport end.

[5] The two M1 cars are each fitted with two pantographs, and the M1' car is fitted with one pantograph (cross-arm type for sets 3708 to 3818 and single-arm type for sets 3848 to 3868).

The transferred set began revenue service with the Hokuso Railway on 26 February 2018.