The Tobu N100 series, branded Spacia X (スペーシアX), is an electric multiple unit (EMU) train type operated by the private railway operator Tobu Railway on limited express services in Japan since 15 July 2023. A total of four 6-car sets were built by Hitachi to replace the ageing 100 series EMUs which have been in service since 1990.

The Tobu 100 series , branded Spacia (スペーシア), is a limited express electric multiple unit (EMU) train type operated by the private railway operator Tobu Railway in Japan since 1990. The trains are used on Kegon, Spacia Nikko, Kinu, and Spacia Kinugawa services to Nikkō and Kinugawa-Onsen.