The Onoda Line (小野田線, Onoda-sen) is a railway line in Yamaguchi Prefecture, Japan, operated by the West Japan Railway Company (JR West).

The Ube Electric Railway Co. opened the Ino – Shin-Okiyama station (since closed) section in 1929, electrified at 600 VDC.

In 1950 the Onoda – Minami-Onoda section was electrified and the voltage increased to 1500 VDC on the balance of the line.

"One-man" driver only operation commenced on the branch line between Suzumeda and Nagato-Motoyama on 11 March 1989, using KuMoHa 42 EMUs.

[1] Driver only (conductorless) operation commenced on the main line between Inō and Onoda on 1 June 1990, using 105 series EMUs.