The ET122 is a diesel multiple unit (DMU) train type operated by the third-sector railway operator Echigo Tokimeki Railway (ETR) on the Nihonkai Hisui Line between Naoetsu and Ichiburi in Niigata Prefecture since operations on the line were transferred from West Japan Railway Company (JR West) on 14 March 2015.

[1] Built by Niigata Transys and based on the JR West KiHa 122 series DMU design, the fleet consists of a total of eight single-car units.

[1] A two-car resort train classified ET122-1000 (cars ET122-1001 + ET122-1002) and branded Setsugekka (雪月花, lit.

"Snow, Moon, Flowers") was built by Niigata Transys and delivered in March 2016.

[5] In May 2017, the ET122-1000 was awarded the 2017 Laurel Prize, presented annually by the Japan Railfan Club.