The Tobu 20000 series (東武20000系, Tōbu 20000-kei) is a DC electric multiple unit (EMU) commuter train type operated by the private railway operator Tobu Railway in Japan since 1988.

A total of 104 vehicles[4] (13 eight-car sets, numbered 21801 to 21813) were built to replace the ageing 2000 series trains on inter-running services between the Tobu Skytree Line and the Tokyo Metro Hibiya Line in Tokyo, entering service on 25 March 1988.

The body design uses a new lightweight corrugated stainless steel construction.

These sets feature two five-door cars at each end, and also LED destination indicators.

[5] As with the 9050 series EMUs introduced around the same time, these sets featured LCD passenger information screens above the doorways, but these were subsequently removed.

These sets feature three-colour LCD passenger information displays above alternate doorways.

[6] The five-door 20000 series trains are being withdrawn so that platform doors can be installed on Tokyo Metro Hibiya Line stations.