The Hagelsund Bridge () is a suspension bridge in Alver Municipality in Vestland county, Norway. The bridge connects the island of Flatøy with the village of Knarvik on the mainland. The length of the bridge is . The length of the main span, i.e. the suspended roadway between the bridge's towers, is .
The bridge consists of 2 lanes with car traffic heading in opposite directions, and a walkway for pedestrians and bicycles. The bridge has a clearance above the ocean for boats to pass beneath the bridge.
The bridge was opened in 1982 and together with the Nordhordland Bridge and the Krossnessundet Bridge, it is a part of the triangular bridge network connecting Flatøy with the island of Holsnøy to the west, the city of Bergen to the south, and Alver Municipality to the east.