The Beriev Be-2500 Neptun (Russian: Бериев Бе-2500 «Нептун») is a super heavy amphibious transport aircraft that, as of 2007, was[needs update] in design and development by Russian design firm Beriev.

[1][2] It has been designed to serve both as a conventional jet aircraft, flying at high altitudes transcontinentally, as well as a craft using the ground-effect on intercontinental routes across the sea.

It is planned to fly via intercontinental routes, taking off from normal seaports without needing special infrastructure.

[4] The concept of the aircraft was developed in the 1980s by the Beriev Design Office in collaboration with TsAGI and TsIAM.

Beriev is planning to cooperate with foreign partners in the development of the aircraft, including financing issues.