Shamrock was the unsuccessful Irish challenger for the 10th America's Cup in 1899 against the United States defender, Columbia. Shamrock was designed by third-generation Scottish boatbuilder, William Fife III, Jr., and built in 1898 by J. Thorneycroft & Co., at Church Wharf, Chiswick, for owner Sir Thomas Lipton of the Royal Ulster Yacht Club. Shamrock was built of all-metal construction, with a steel frame and a pine deck. She was skippered by Captain Archibald "Archie" Hogarth.