The Odakyu 60000 series MSE is a Romancecar electric multiple unit (EMU) train type operated by the private railway operator Odakyu Electric Railway in Japan since March 2008. The trains are used on Odakyu through service to the Tokyo Metro Chiyoda Line, and some trains also travel over the Tokyo Metro Yurakucho Line, making it the first limited express train with reserved seats to operate through a subway line in Tokyo.

The Romancecar is Odakyu Electric Railway's name for its limited express luxury tourist services south-west of Tokyo, to mountain resorts such as Hakone and Gotemba, and beaches such as Odawara and Enoshima. When the service started in 1957 with the 3000 series SE trainset, it broke the world speed record for a narrow gauge train. This record gave impetus for the design of the first Shinkansen, the 0 series. The 50th anniversary of the Romancecar's narrow gauge world speed record was celebrated September 28, 2007. Some of the latest designs incorporate regenerative braking.