The Tobu 300 series and 350 series (東武300系・350系, Tōbu 300/350-kei) were limited express electric multiple unit (EMU) train types operated by the private railway operator Tobu Railway in Japan from July 1991 until March 2022.

Rebuilt from former 1800 series express sets, the trains were used on limited express and charter services on the Tobu Skytree Line and Tobu Nikko Line.

[2] The 350 series sets were normally used on Shimotsuke limited express services, while the 300 series was used on Kirifuri limited express services.

[1] Three 350 series four-car sets were similarly rebuilt in 1991, with the trains entering service from the start of the revised timetable on 21 July 1991.

[4] On 6 March 2022, the 350 series four-car sets were also withdrawn from service, alongside the discontinuation of Kirifuri limited express services.