Otago Harbour is the natural harbour of Dunedin, New Zealand, consisting of a long, much-indented stretch of generally navigable water separating the Otago Peninsula from the mainland. They join at its southwest end, 21 km (13 miles) from the harbour mouth.
It is home to Dunedin's two port facilities, Port Chalmers (half way along the harbour) and at Dunedin's wharf (at the harbour's end).The harbour has been of significant economic importance for approximately 700 years, as a sheltered harbour and fishery, then deep water port.