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|---|---|
| ทางหลวงแผ่นดินหมายเลข 3 | |
| ถนนสุขุมวิท Thanon Sukhumwit | |
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| Route information | |
Part of  AH123 (Rayong to Border to  Cambodia) | |
| Length | 488.387 km (303.470 mi) |
| Existed | 1936–present |
| Major junctions | |
| West end | .svg){kind=small} Phloen Chit Road in Pathum Wan, Bangkok |
 / in Bang Na, Bangkok in Mueang Samut Prakan, Samut Prakan/ in Bang Pakong, Chachoengsao/ in Mueang Chonburi, Chonburi in Mueang Chonburi, Chonburi in Mueang Chonburi, Chonburi in Mueang Chonburi, Chonburi / / in Si Racha, Chonburi in Bang Lamung, Chonburi in Pattaya, Bang Lamung, Chonburi in Sattahip, Chonburi in Sattahip, Chonburi / in Sattahip, Chonburi in Ban Chang, Rayong in Ban Chang, Rayong in Mueang Rayong, Rayong in Mueang Rayong, Rayong in Mueang Rayong, Rayong in Klaeng, Rayong / in Mueang Chanthaburi, Chanthaburi in Mueang Chanthaburi, Chanthaburi | |
| Southeast end |  NH48 AH123 in Khlong Yai District, Trat, border to Cambodia |
| Location | |
| Country | Thailand |
| Provinces | Bangkok, Samut Prakan, Chachoengsao, Chonburi, Rayong, Chanthaburi, Trat |
| Highway system | |
Sukhumvit Road (Thai: ถนนสุขุมวิท, RTGS: Thanon Sukhumwit, pronounced [tʰā.nǒn sùʔ.kʰǔm.wít]), or Highway 3 (Thai: ทางหลวงแผ่นดินหมายเลข 3), is a major road in Thailand, and a major surface road of Bangkok and other cities. It follows a coastal route from Bangkok to Khlong Yai District, Trat border to Koh Kong, Cambodia.
Sukhumvit Road is named after the fifth chief of the Department of Highways, Phra Bisal Sukhumvit. It is one of the four major highways of Thailand, along with Phahonyothin Road (Highway 1), Mittraphap Road (Highway 2) and Phetkasem Road (Highway 4).