The 251 series (Japanese: 251系) was a DC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) on Tokaido Main Line Super View Odoriko limited express services in Japan between April 1990[1] and March 2020.

The 251 series sets were primarily used on Super View Odoriko limited express services from Tokyo, Ikebukuro, and Shinjuku to Izukyu Shimoda.

[6] The fleet underwent a programme of refurbishment between December 2002 and March 2004, which included the addition of new seating, and repainting the sets into a new colour scheme.

[2] From the start of the revised timetable on 14 March 2020, the 251 series sets were replaced by new E261 series sets on services between Tokyo and Izukyu-Shimoda, with the Super View Odoriko brand being replaced by new ultra-deluxe Saphir Odoriko services.

The last 251 series Super View Odoriko limited express run took place on 13 March 2020.