The Portbury Dock (Port Code:GBPBY) is part of the Port of Bristol, in England. It is situated near the village of Portbury on the southern side of the mouth of the Avon, where the river joins the Severn estuary — the Avonmouth Docks are on the opposite side of the Avon, within Avonmouth. The deepwater dock was constructed between 1972 and 1977, and is now a major port for the import of motor vehicles into the UK. The M5 motorway runs nearby, and the huge car storage compounds around the dock are visible from the Avonmouth Bridge. A waste industrial area west of the port is being developed as the Portbury Ashlands Nature Reserve.
It has the largest entrance lock into any UK port, accommodating vessels up to 41 m (135 ft) beam, 290 m (951 ft) length and 14.5 m (48 ft) draft. The dock is now operated by The Bristol Port Company, which also operates Avonmouth Docks, and has done since 1991 when it purchased a 150-year lease from Bristol City Council. In 2004, over 650,000 vehicles were handled. The Dock can accommodate up to six RoRo vessels simultaneously. Aviation fuel tankers up to 120,000 dwt can discharge at the Bristol Aviation Fuel Terminal which opened in 2003, and feeds directly into the UK's pipeline and storage network.