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.

The Tobu Railway Company, Ltd. is a Japanese commuter railway and keiretsu holding company in the Greater Tokyo Area as well as an intercity and regional operator in the Kantō region. Excluding the Japan Railways Group companies, Tobu's 463.3 km (287.9 mi) rail system is the second longest in Japan after Kintetsu. It serves large portions of Saitama Prefecture, Gunma Prefecture and Tochigi Prefecture, as well as northern Tokyo and western Chiba Prefecture. The Tobu Railway Company is listed in the First Section of the Tokyo Stock Exchange and is a constituent of the Nikkei 225 index.