The SS Olympia was a steamship laid down as the SS Doune Castle and upon purchase named the SS Dunbar Castle that served the northwest United States and Alaska during the Klondike Gold Rush. It was built in 1883 by Barclay, Curle and Co. of Glasgow, Scotland, for the Castle Mail Packet Company. In 1895, the SS Dunbar Castle was sold to Fairfield Ship Building and Engineering Co.