SS City of Peking was an iron-hulled steamship built in 1874 by John Roach & Sons for the Pacific Mail Steamship Company. City of Peking and her sister ship City of Tokio were at the time of construction the largest vessels ever built in the United States, and the second largest in the world behind the British leviathan Great Eastern. In addition to her cargoes, City of Peking brought many Chinese and Japanese immigrants to the United States, and later served as a troopship in the Spanish–American War.