The Seibu 2000 series (西武2000系) is an electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway on commuter services in the Tokyo area of Japan since 1977.

As of 12 December 2022[update], the fleet consists of 290 vehicles formed as two-car, four-car, six-car, and eight-car sets, and is based at Kotesashi, Musashigaoka, Minami-Iriso, Tamagawa-Josui depots for use on the Seibu Shinjuku Line and Seibu Ikebukuro Line.

The 2000 series trains were introduced on local train services on the Seibu Shinjuku Line in 1977, featuring four pairs of sliding doors on each side to speed up boarding and alighting at stations, and they were initially formed as six-car sets.

From new 2000 series train sets that were more than 20 years after they were made, a renewal and some fixing of the parts were started.

From 18 March 2017, set 2007 had a wrapping depicting Japan and Taiwan's tourist spots.

[11] From 26 February 2018, the design was renewed, and it started running as "Seibu Railway x LAIMO" wrapping train second edition.

From 24 January 2023, set 2069's color was changed and it was run as "Seibu Railway 110th Anniversary Train".

[24] As part of Seibu group's plan to overcome the Covid-19,[25][26] an abnormal amount[clarification needed] of train sets were withdrawn.

[28] The cab end of former car Tc 2098 is preserved inside the Maruzen Ikebukuro bookshop in Toshima, Tokyo.

Built in June 1992 at Seibu Railway's Tokorozawa factory, it was withdrawn in September 2016, and moved to the ground floor of the Maruzen Ikebukuro bookshop building in March 2017, while still under construction.