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|---|---|
| ทางหลวงแผ่นดินหมายเลข 1 | |
| ถนนพหลโยธิน Thanon Phahon Yothin | |
 | |
| Route information | |
Part of  AH1 AH2 AH12 | |
| Length | 1,005 km (624 mi) |
| Existed | Before 1936–present |
| Major junctions | |
| South end | Bangkok, Victory Monument |
| North end | Mae Sai district, Chiang Rai, border to  Myanmar |
| Location | |
| Country | Thailand |
| Provinces | Pathum Thani, Ayutthaya, Saraburi, Lopburi, Nakhon Sawan, Chainat, Kamphaeng Phet, Tak, Lampang, Phayao |
| Highway system | |
Phahonyothin Road (Thai: ถนนพหลโยธิน, RTGS: Thanon Phahon Yothin, pronounced [tʰā.nǒn pʰā.hǒn jōː.tʰīn]) or Highway 1 is a main road in Bangkok and one of the four primary highways in Thailand, which include Mittraphap Road (Highway 2), Sukhumvit Road (Highway 3), and Phet Kasem Road (Highway 4). It begins at Victory Monument in Bangkok and runs north to the Burmese border, with a total length of 1,005 km (624 mi).