The KiHa 120 (キハ120形, Kiha-120-gata) is a single-car diesel multiple unit (DMU) train type operated by West Japan Railway Company (JR-West) on its rural lines in Japan.

Based on Niigata Tekkō's "NDC" lightweight diesel car design intended for third sector operators (such as Matsuura Railway, Takachiho Railway, and Kumagawa Railway), a total of 89 cars were built, with the class divided into three sub-classes: KiHa 120-0, KiHa 120-200, and KiHa 120-300.

These had painted steel bodies, two-pane windows, transverse and longitudinal seating, and no toilets.

These had uprated engines, stainless steel bodies, single-pane windows, longitudinal seating, and no toilets.

These were similar in design to the KiHa 120-0 subclass, but were built with some transverse seating.