The San Juanico Bridge is part of the Pan-Philippine Highway and stretches from Samar to Leyte across the San Juanico Strait in the Philippines. Its longest length is a steel girder viaduct built on reinforced concrete piers, and its main span is of an arch-shaped truss design. Constructed during the administration of President Ferdinand Marcos through Japanese Official Development Assistance loans, it has a total length of 2.16 kilometers (1.34 mi)—the third longest bridge spanning a body of seawater in the Philippines after the Panguil Bay Bridge. It was also the longest bridge in the Philippines upon its opening in 1973, surpassed in 1976 by Candaba Viaduct of North Luzon Expressway (NLEX), another bridge that connects from one province to another, connecting the provinces of Pampanga and Bulacan.

The bridge has helped bolstered economic activity in Samar and Leyte and has become an iconic tourist attraction.