Douglas Bay is a walk-in wilderness campsite located on the north side of Gambier Island in Howe Sound, British Columbia, accessible by paddling from Gibsons Harbour or Port Mellon.

It is one of five major campsites situated around the perimeter of Gambier Island, alongside West Bay, Halkett Bay, Brigade Bay, and Ekins Point. The site sits near Gambier Creek and is notable for a waterfall in its vicinity.

From Douglas Bay, hikers can access Gambier Lake via an approximately three-hour trail through the forest.

The surrounding area offers opportunities to spot seabirds and seals, take in views of the coastal mountains, and watch marine traffic including tugboats working log booms through Howe Sound.