GLACE BAY, a city and port of entry of Cape Breton county, Nova Scotia, Canada, on the Atlantic ocean, 14 m. E. of Sydney, with which it is connected by railway. It is the centre of a coal-producing district. Though it has a fair harbour, most of the shipping is done from Sydney in summer and from Louis burg in winter. Pop. (1931) 20,706. It is a transatlantic wireless station.