Highway 32 (Thai: ทางหลวงแผ่นดินหมายเลข 32, RTGS: Thang Luang Phaendin Mai Lek Sam Sip Song) is a national highway in Thailand.

It begins in Bang Pa-In District in Phra Nakhon Si Ayutthaya Province at the junction of Phahonyothin Road (Highway 1) and the Outer Bangkok ring road (Motorway 9), then passes through the provinces of Ang Thong, Singburi, and Chainat, where it merges back into Phahonyothin Road directly at the border with Nakhon Sawan Province.

Two toll booths are still there today, but are now used as an administration building.

Compared with other long haul routes in the same direction, Highway 32 provide a shorter and faster way from Bangkok to Nakhon Sawan and Northern Thailand.

It belongs to the Asian Highway Network's AH1 and AH2 and the Kunming-Bangkok Expressway.