Port Chalmers is a suburb and the main port of the city of Dunedin, New Zealand, with a population of 3,000. Port Chalmers lies ten kilometres inside Otago Harbour, some 15 kilometres northeast from Dunedin's city centre.
Much of Port Chalmers is located on a small hilly peninsula, at the northern end of which is a large reclaimed area which is now the site of Dunedin's container port. Close to the southeastern shore of this peninsula are a pair of islands, which lie across the harbour between Port Chalmers and the Otago Peninsula. These two islands are Quarantine Island/Kamau Taurua and Goat Island. Prior to the local body reorganisation in the 1980s Port Chalmers was made up of several suburbs, as well as the central area, Roseneath, Blanket Bay, Upper Junction, Brick Hill, Sawyers Bay, Mussel Bay, Upper Port Chalmers, Dalkeith, Careys Bay, Reynoldstown, Deborah Bay, Hamilton Bay, Waipuna Bay, Te Ngaru, and Aramoana, as well as the outlying townships of Long Beach, Purakanui and several other smaller nearby villages and farmsteads.
Although the harbour beyond Port Chalmers is regularly dredged, most of the port activity is centred on Port Chalmers rather than on central Dunedin. Part of the reason for this is the narrowness of the Victoria Channel, the one part of the Otago Harbour navigable by large ships, which makes it far easier for berthing to take place at Port Chalmers, closer to the open sea. Any big ships venturing into the upper harbour wharfs need to be piloted in with the help of tugs.
The port was the last visited by Robert Falcon Scott before heading south on his final expedition to Antarctica. A large stone monument now stands above the town dedicated to Scott's final expedition.
Most of Port Chalmers' economic activity centres on the container terminal. Fishing, of historic importance, is now only a small part of the economy.
Port Chalmers was also the appellation of a ship which sailed between England, Australia and New Zealand at the beginning of the 20th century. It was torpedoed in mid-October 1940 and sunk, with some crew surviving 14 days at sea on the lifeboat.