The 681 series (681系, 681-kei) is a dual-voltage electric multiple unit (EMU) train type operated by West Japan Railway Company (JR-West) on limited express services in Japan.

These trains featured "White Wing" logos.

[4] From February 2015, Hakutaka W sets began being repainted into the same livery as 683 series trainsets used on Shirasagi services, with thin blue and orange lines below the window band.

These trains featured "Snow Rabbit Express" logos.

[4] All of the 681 series trainsets used on Thunderbird limited express services underwent a programme of refurbishment from autumn 2015 until the end of fiscal 2018.