Sukhumvit Road (Thai: ถนนสุขุมวิท, Thanon Sukhumwit), or Thailand Route 3 (Thai: ทางหลวงแผ่นดินหมายเลข 3), is a major road in Thailand, and a major surface road of Bangkok and other cities it winds through. It follows a coastal route from Bangkok to Trat and is just over 400 km (250 mi) in length.

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 (Route 1), Mittraphap Road (Route 2) and Phetkasem Road (Route 4).