The Chichibu Railway 7800 series (秩父鉄道7800系) is a 2-car electric multiple unit (EMU) train type operated by the Japanese private railway operator Chichibu Railway on Chichibu Main Line local services since 16 March 2013.

Conversion details include the removal of electrical equipment from one former motored car, the addition two lozenge-type pantographs on the DeHa 7800 car, and the addition of new cab ends.

[3] The first set was rebuilt by Tokyu Techno Systems in December 2012.

[2] It entered service from the start of the revised timetable on 16 March 2013.

[1] The conversion histories and former identities of the fleet are as shown below.