The Chiba New Town Railway 9000 series (千葉ニュータウン鉄道9000形) was a commuter electric multiple unit (EMU) train type formerly owned by the third-sector railway company Chiba New Town Railway and operated by the Hokuso Railway on the Hokuso Line in Japan from 1984 until 20 March 2017.

[2] The cars of set 9008 were numbered in sequence from 9001 to 9008, and the cars of set 9018 were numbered in sequence from 9011 to 9018.

[2] The trains were introduced in 1984, coinciding with the opening of the section of the Hokuso Line between Komuro and Chiba New Town Chūō.

[3] The trains were initially classified as "2000 series", and formed as six-car sets.

[3] The two six-car train sets were lengthened to eight cars each in 1991, coinciding with the start of inter-running services to and from the Toei Asakusa Line.