The KiHa 01 series (キハ01系, Kiha-ichi-kei) and the related KiHa 02 (キハ02) and KiHa 03 (キハ03) were railbus types operated by Japanese National Railways (JNR) from 1954 until 1969.

A total of 49 vehicles were built between 1954 and 1956, originally classified as KiHa 10000 (キハ10000形).

[1] Four prototypes entered service on the Kihara Line (present day Isumi Railway Isumi Line) in 1954.

[2] In 1957, the KiHa 10000 were reclassified as KiHa 01 and 02, the KiHa 10200 were reclassified as KiHa 03.

[1] The last unit, KiHa 02 10, was withdrawn in 1969.