The Odakyu 9000 series (小田急9000形, Odakyū 9000-gata) was a commuter electric multiple unit (EMU) train type operated by the private railway operator Odakyu Electric Railway in Japan from 1972 until 2006.

The trains were equipped with 110 kW motors and chopper control.

[5] The trains entered service in 1972, and were the recipient of the 1973 Laurel Prize.

[6] Chiyoda Line through services with 9000 series trains began on March 31, 1978.

[5] Trains of a similar design operate on the Roca Line in Argentina.