The Northeastern Line (Thai: ทางรถไฟสายตะวันออกเฉียงเหนือ) is a railway line in Thailand that connects the capital Bangkok with the northeast region of Isan.

The section from Bangkok to Nakhon Ratchasima is Thailand's first line that opened for passenger service.

[2] The line is also a key section on the central route of the Kunming–Singapore railway.

The Northeastern Line shares tracks with Northern Line between Bangkok and Ban Phachi Junction.

It has three main branches: SRT also built a short railway line from Bung Wai to Ban Pho Mun which was opened on 1 August 1930,[4] but the line was closed on 1 December 1954 due to the construction of Seri Prachathippatai bridge (officially opened in 1955) that allowed the connection between Ubon Ratchathani city and Ubon Ratchathani without the need for ferry across Mun river.