The Halsema Highway (also known as the Benguet–Mountain Province Road, the Baguio–Bontoc Road, and the Mountain Trail) is a national secondary highway in the Philippines. Situated within the Cordillera Central range in northern Luzon, it stretches from the city limit of Baguio to the municipality of Bontoc. Its highest point is at 2,255.52 metres (7,400.0 ft) above sea level in the municipality of Atok. It was officially recognized as the highest altitude highway in the Philippines until 2019, when the 2,429 metres (7,969 ft) high point Kiangan–Tinoc–Buguias Road in Tinoc, Ifugao, was recognized as the new holder of the distinction.

The 150-kilometer (93.2 mi) highway covers 95 kilometers (59 mi) of Benguet province and traverses eight of its municipalities (La Trinidad, Tublay, Atok, Bokod, Kabayan, Buguias, Bakun, and Mankayan). It also covers four Mountain Province towns (Bauko, Sabangan, Bontoc, and Sagada). The road splits into two upon reaching the village of Dantay, in Bontoc. One road leads to downtown Bontoc, while the other leads to the town of Sagada, 29 kilometers (18.0 mi) farther from the junction.

The highway forms part of National Route 204 (N204) of the Philippine highway network.