Mittraphap Road (Thai: ถนนมิตรภาพ, RTGS: Thanon Mittraphap, pronounced [tʰā.nǒn mít.trā.pʰâːp]; Northeastern Thai: ถนนมิตรภาพ, pronounced [tʰā.nǒn mìt.tā.pʰâːp]) or Highway 2 (Thai: ทางหลวงแผ่นดินหมายเลข 2, RTGS: Thang Luang Phaendin Mailek Song) is one of the four primary highways in Thailand, along with Phahonyothin Road (Highway 1), Sukhumvit Road (Highway 3), and Phetkasem Road (Highway 4).

The road was originally built from Khorat to Nong Khai by the United States in 1955–1957[1] at a cost of US$20 million to supply its northeastern military bases.

It is the main road that connects Isan (northeastern Thailand) across the Dong Phaya Yen Range.

It passes through the provinces of Nakhon Ratchasima, Khon Kaen, Udon Thani, and ends in Nong Khai, where it links with the Thai-Lao Friendship Bridge to Laos.

This Thailand road article is a stub.