Highway 11 (Thai: ทางหลวงแผ่นดินหมายเลข 11; Thang Luang Phaendin Mai Lek 11) is a national highway in Thailand.

Considered as an alternative road for Route 1 to the North of Thailand.

It begins in Amphoe In Buri, in Singburi Province, at the junction of Thailand Route 32 (National Road 32), and then runs north through Nakhon Sawan Province, Phichit Province, and Phitsanulok Province where, for approximately 10 kilometers, it merges with Highway 12.

The Highway 11 ends at the intersection of the Superhighway with Huai Kaeo Road (National Road 1004), northwest of the old city of Chiang Mai.

In 2019, the four-lane expansion between In Buri and Takhli began.