Ofotfjord ( or ) is a fjord in Nordland county, Norway. It is an inlet of the Norwegian Sea, located about north of the Arctic Circle. The long Ofotfjord is Norway's 12th longest fjord and it is also the 18th deepest, with a maximum depth of . In the English language and in many historical documents, this fjord is often referred to as the Narvik Fjord because the town of Narvik is located on the inner shores of the fjord, but this is not an official name of the fjord.
The fjord is surrounded by mountains, some reaching , and even in Skjomen, where the Frostisen glacier can be seen. The only large lowland area is on parts of the northern shore, around Harstad/Narvik Airport, Evenes, although there are smaller areas near the fjord and in narrow valleys (for instance, the Narvik peninsula, where the harbour and city centre of Narvik is located).
The mountains are covered by forest below elevations of , birch being the most common tree, but pine and aspen are also common. The bedrock around the fjord consist of both hard minerals like gneiss and granite as well as softer minerals rich in lime; there is a dolomite quarry in the municipality of Narvik Municipality (photo).
The surrounding Ofoten district is named after the Ofotfjord (Old Norse: Ófóti). The meaning of the first element is unknown and the last element is derived from the Old Norse word fótr which means "foot". The oldest form of the name could have been Úffóti. In this case, the first element is úfr which means "Eurasian eagle-owl". The three inner branches of the Ofotfjord might have been compared with the three claws of an owl.
The Ofotfjord is the longest fjord in Nordland county and the fourth longest in Northern Norway. The municipalities of Tjeldsund and Evenes are located on the northern shore and the large Narvik Municipality is located on the eastern and southern shores of the fjord. The municipality of Lødingen (and beyond that Lofoten) and the large Vestfjord is located west-south-west of the Ofotfjord.
Several smaller fjord branches extend from the main fjord.