| Stuart Island | |
| Map Size: | 260px |
| Location: | Bute Inlet and Calm Channel |
| Coordinates: | 50.3833°N -131.5°W |
| Archipelago: | Discovery Islands |
| Country: | Canada |
| Country Admin Divisions Title: | Province |
| Country Admin Divisions: | British Columbia |
| Country Admin Divisions Title 1: | Regional district |
| Country Admin Divisions 1: | Strathcona |
Stuart Island is one of the Discovery Islands of British Columbia, which lie between northern Vancouver Island and the British Columbia Coast. It is privately owned and has no ferry access. It is situated at the mouth of Bute Inlet to the east of the larger Sonora Island within Electoral Area C of the Strathcona Regional District. The island, and Bute Inlet, were named for John Stuart, 3rd Earl of Bute, Prime Minister of Great Britain from 1762 to 1763.
The island is mostly home to exclusive fishing lodges and large private estates. Most of the visitors arrive by float plane or helicopter. Nanook Lodge is the only fishing/adventure lodge open to the public on Stuart Island and has scheduled daily seaplane service from Seattle.
Among the property owners on this island is Dennis Washington, a Montana businessman and owner of the Seaspan Marine Corporation, Dave Ritchie, a Vancouver businessman and Kris Mailman, owner and CEO of Seymour Pacific Developments and Broadstreet Properties. Washington has built a 9-hole golf course out of the granite on his estate.
Stuart Island has a paved, private airstrip, approximately 2100 feet long. It does not appear on any aeronautical chart or in the Canada Flight Supplement. The Big Bay Water Aerodrome appears in the Water Aerodrome Supplement.