The E261 series (Japanese: E261系, Hepburn: E261-kei) is an electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) in Japan on Saphir Odoriko limited express services between Tokyo and Izukyū-Shimoda.

It was designed to replace the older 251 series trains that were used on Super View Odoriko limited express services from April 28, 1990, until March 13, 2020.

The car bodies are made of aluminum, and the trains use three phase motors and VVVF inverters.

The trains are formed as eight-car sets, with five motored and three trailer cars.

All seats except private compartments are equipped with personal reading lights, and all cars feature Wi-Fi connection.