Tanquary Fiord, Arctic fjord in Quttinirpaaq National Park, Nunavut, Canada.

Tanquary Fiord is a fjord on the north coast of Ellesmere Island in Nunavut, Canada, within Quttinirpaaq National Park. It runs 48 km north-west from Greely Fiord. At its head, four river valleys meet: three end in a floodplain and one in a river delta. Side glaciers have retreated at their terminal points over the past 40 years.

This fjord became ice-free gradually after the last glacial period ended, a process lasting from around 10,000 to roughly 4,100 years ago. The landscape we see today took shape through this long melting and retreat of glacial ice.

The fiord's name honours Maurice Cole Tanquary, a fellow explorer of Donald Baxter MacMillan, who named the waterway during the Crocker Land Expedition. Charcoal dated by the Geological Survey of Canada shows Inuit were present here by about 1070 years ago. Today the only summer residents are Parks Canada wardens at the station near the airstrip.

Access requires charter aircraft or icebreaker cruise ships since the location sits in an extremely remote part of the Arctic. A Parks Canada ranger station operates during summer months to assist visitors in the area.

This fjord has a surprisingly long growing season for the Arctic, with around 65 frost-free days each year. These conditions allow local gardeners to cultivate crops like lettuce in this far northern setting.