The Auckland Harbour Bridge is an eight-lane motorway bridge over the Waitematā Harbour in Auckland, New Zealand. It joins St Marys Bay on the Auckland city side with Northcote on the North Shore side. It is part of State Highway 1 and the Auckland Northern Motorway. The bridge is operated by the NZ Transport Agency (NZTA). It is the second-longest road bridge in New Zealand, and the longest in the North Island.The original inner four lanes, opened in 1959, are of box truss construction. Two lanes that were added to each side in 1968–1969 are of orthotropic box structure construction and are cantilevered off the original piers. The bridge is 1,020 m (3,348 ft) long, with a main span of 243.8 metres, rising 43.27 metres above high water, allowing ships access to the deepwater wharf at the Chelsea Sugar Refinery, one of the few such wharves west of the bridge.

While often considered an Auckland icon, many see the construction of the bridge without walking, cycling, and rail facilities as a big oversight. In 2016, an add-on structure providing a walk-and-cycleway called SkyPath received Council funding approval and planning consent, but wasn't built. In 2021, a stand-alone walking and cycling bridge called the Northern Pathway was announced by the New Zealand Government, but also wasn't built.About 170,000 vehicles cross the bridge each day (as of 2019), including more than 1,000 buses, which carry 38% of all people crossing during the morning peak.