The Chichibu Railway 1000 series (秩父鉄道1000系) was an electric multiple unit (EMU) train type for local services operated by Chichibu Railway in Japan from 1986 until March 2014.^[1][2]

Twelve three-car trains were converted in 1986 from former JNR 101 series commuter EMUs. Conversion included the addition of a second pantograph on the DeHa 1000 cars and the inclusion of a luggage area at the cab ends separated by a curtain arrangement.^[1]

Air-conditioning was added to the end cars from fiscal 1994, with the centre cars in each set left without air-conditioning.^[3]

The trains were modified for wanman driver only operation from December 1999.^[1] The final train ran on 23 March 2014.^[2]

The formations and former 101 series identities were as shown below.^[4]

The DeHa 1000 car was fitted with two lozenge-type pantographs.^[5]

• Set 1007 repainted into the original livery carried until the 1990s (April 2010)
• Set 1010 in the second livery carried from the 1990s (December 2007)
• Set 1011 repainted into JNR orange livery (September 2007)
• Set 1001 repainted into JNR sky blue livery (January 2008)
• Set 1012 repainted into JNR canary yellow livery (January 2009)
• Set 1009 repainted into JR Kansai area light green livery (April 2008)
• Set 1002 repainted into the early Chichibu Railway livery (not originally carried by these EMUs) (January 2010)