2100 series

2100 series may refer to the following Japanese train types:


 * Chikuho Electric Railroad 2100 series electric multiple unit operated on the Chikuhō Electric Railroad Line
 * Ichibata Electric Railway 2100 series EMU
 * Izukyū Corporation 2100 series EMU
 * Iyotetsu 2100 series streetcar
 * Kanto Railway KiHa 2100 series DMU
 * Keikyu 2100 series EMU, introduced in 1998
 * Keisei 2100 series EMU; see
 * Nagano Electric Railway 2100 series EMU, introduced in 2011
 * Odakyu 2100 series EMU, see Odakyu 2000 series