The Tobu 100 series (Japanese: 東武100系, romanized: Tōbu 100-kei), 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.

[2] As of 1 April 2012[update], the fleet consists of nine sets, based at Kasukabe Depot, and formed as follows.

[3] The fleet underwent a programme of refurbishment from December 2011, ahead of the opening of the Tokyo Skytree in May 2012.

Internally, the seats feature new moquette, with blue in the open saloons and brown in the compartments.

[7] Set 103 was repainted in a special gold and black livery and branded "Nikko Moude Spacia" (日光詣スペーシア) from April 2015.