The Pan-Philippine Highway, also known as the Maharlika Highway, is a network of roads, expressways, bridges, and ferry services that connect the islands of Luzon, Samar, Leyte, and Mindanao in the Philippines, serving as the country's principal transport backbone. Measuring 3,379.73 kilometers (2,100.07 mi) long excluding sea routes not counted by highway milestones, it is the longest road in the Philippines that forms the country's north–south backbone component of National Route 1 (N1) of the Philippine highway network. The entire highway is designated as Asian Highway 26 (AH26) of the Asian Highway Network.

National Route 1 (N1) is a primary national route that forms part of the Philippine highway network, running from Luzon to Mindanao. Except for a 19-kilometer (12 mi) gap in Metro Manila and ferry connections, the highway is generally continuous. Most sections of N1 forms the Pan-Philippine Highway except for sections bypassed by expressways.