The Super Oki (スーパーおき) is a limited express train service in Japan operated by the West Japan Railway Company (JR West) since July 2001.

[1] The Super Oki is one of the farthest-travelling limited express trains in Japan, covering the 380 km from Shin-Yamaguchi to Tottori in just over five hours.

Trains stop at the following stations: Tottori - Kurayoshi - Yonago - Yasugi - Matsue - (Tamatsukuri-Onsen) - (Shinji) - Izumoshi - Ōdashi - (Yunotsu) - Gōtsu - (Hashi) - Hamada - (Miho-Misumi) - Masuda - Nichihara - Tsuwano - Tokusa - Mitani - Yamaguchi - Yudaonsen - Shin-Yamaguchi Not all trains stop at stations in parentheses.

Super Oki services are normally formed of two-car KiHa 187 series tilting DMU sets, sometimes lengthened to three or four cars during busy seasons.

Two-car trains are formed as shown below, with car 1 at the Shin-Yamaguchi end.