The E259 series (E259系) is a DC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) in Japan since October 2009 on Narita Express limited express services to and from Narita International Airport.

E259 series trains were also used occasionally on seasonal Marine Express Odoriko services between Tokyo and Izukyū-Shimoda.

These feature two 17-inch screens on each side, displaying information in four languages (Japanese, English, Korean, and Chinese).

[1] The first two sets, Ne001 and Ne002, were delivered to Kamakura Depot from Tokyu Car Corporation's Yokohama factory on 23 April 2009, with test running on the Sōbu Main Line commencing the same day.

[7] In March 2023, JR East announced that it would introduce a new design to existing E259 series sets.

The updated livery will retain the black and red color pallet but will feature silver accents at the front as well as the phrase "SERIES E259" being plastered along the exterior.

[12] As of 17 March 2024, repainting for the entire E259 series fleet was completed with the last set, Ne022, having received the new livery.