The Sotetsu 20000 series (相鉄20000系) is an electric multiple unit (EMU) commuter train type operated by the private railway operator Sagami Railway ("Sotetsu") in Japan in the Tokyo area since February 2018.

[1] Eight-car sets designated as 21000 series were announced in April 2021,[2] the first of which entered service in September 2021.

[3] The fleet of ten-car 20000 series trainsets is being built by Hitachi at its Kasado Factory in Kudamatsu, Yamaguchi.

[5] The colour temperature of the interior LED lighting is adjusted automatically according to time of day and season as follows (hues shown are illustrative only).

[5] The first train set was delivered from the Hitachi factory in Kudamatsu, Yamaguchi, in late July 2017.