In physical geography, a fjord or fiord is a long, narrow sea inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Antarctica, the Arctic, and surrounded landmasses of the northern and southern hemispheres. Norway's coastline is estimated to be 29,000 km (18,000 mi) long with its nearly 1,200 fjords, but only 2,500 km (1,600 mi) long excluding the fjords.

Drammensfjord is a fjord in along the border of Akershus and Buskerud counties in Norway that connects to Ytre Oslofjord on the west side. It stretches about 30 kilometres (19 mi) to the north and northeast. The Drammenselva river discharges into the head of the fjord. The fjord shares its name with the city of Drammen which is located at the head of the fjord. Drammen Municipality in Buskerud county is located on the west and north sides of the fjord. The land on the east side of the fjord is called Hurumhalvøya or the Hurum peninsula and this is located in Asker Municipality. The Hurum peninsula lies between the Drammensfjord and the Oslofjord.