SS Yongala was a passenger steamship that was built in England in 1903 for the Adelaide Steamship Company. She sank in a cyclone off the coast of Queensland in 1911, with the loss of all 122 passengers and crew aboard.

The Adelaide Steamship Company was an Australian shipping company, later a diversified industrial and logistics conglomerate. It was formed by a group of South Australian businessmen in 1875. Their aim was to control the transport of goods between Adelaide and Melbourne and profit from the need for an efficient and comfortable passenger service. For its first 100 years, the company's main activities were conventional shipping operations on the Australian coast, primary products, consumer cargoes and extensive passenger services.