Grafton Bridge, Heritage road bridge in Auckland Region, New Zealand

Grafton Bridge is a reinforced concrete road bridge spanning Grafton Gully between Karangahape Road and Grafton Road in Auckland. Its single main arch has a span of 97.6 metres, rising 25.6 metres above the abutments and about 43 metres above the gully floor. The deck carries one traffic lane each way with footpaths on both sides, and a curved plexiglass screen runs along the railings.

The first bridge on the site, an 1884 cable-stay pedestrian span, was closed in 1904 after a report found it beyond repair. The present reinforced concrete bridge, designed by R. F. Moore and Karl Rosegger Agster, was built over two years and opened on 28 April 1910 by mayor Charles D. Grey. Its contractor, the Ferro-Concrete Company of Australasia, went bankrupt in 1909 and the city finished the work.

The bridge crosses part of the Symonds Street Cemetery, in use for 70 years when it was built; its route required moving only eight graves, among them those of early settlers. Since 2009 it has carried the Central Connector bus route between the CBD and Newmarket, closed to private cars except taxis by day.

The bridge carries one traffic lane in each direction with a footpath on each side. Since 2009 it has been closed to private vehicles during the day except taxis, forming part of the Central Connector bus route. A curved plexiglass screen runs along the railing, installed in 2002 to prevent jumps.

The large false piers flanking the central arch look like classical masonry but carry no load; the arch itself takes the full weight through thin vertical members. At the April 1910 opening, two steam rollers were driven across to prove the untested concrete design.