The Odakyu 20000 series RSE (小田急20000形, Odakyū 20000-gata) (Resort Super Express) was an electric multiple unit (EMU) train type operated between 1991 and March 2012 by the private railway operator Odakyu Electric Railway on Asagiri limited express services in Japan.

Up until 16 March 2012, the 20000 series RSE operated mainly between Odakyu's Shinjuku terminus in Tokyo and JR Central's Numazu Station on the Gotemba Line.

[4] In 1992, the 20000 series RSE was awarded the Blue Ribbon Award, presented annually in Japan by the Japan Railfan Club for railway vehicles voted as being the most outstanding design of the year.

[5] The 20000 series sets were withdrawn on 16 March 2012,[6] and replaced by 60000 series MSE 6-car sets on Asagiri services from the start of the revised timetable on 17 March 2012.

[9] The remaining set, 20002, was moved to the Nippon Sharyo factory in Toyokawa, Aichi, in November 2013, where it was reformed and converted to become a 3-car Fujikyu 8000 series set for use on Fuji Kyuko Fujisan Limited Express services from July 2014.