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. Ultimately intended to be used on through-running services between Sotetsu and Tokyu Corporation lines commencing in late fiscal 2022, the first train entered revenue service on 11 February 2018, replacing a 7000 series set. Eight-car sets designated as 21000 series were announced in April 2021.