Marlborough was an iron-built two-decked merchant sailing ship which disappeared in 1890. She was built by the firm of Robert Duncan and Co., Port Glasgow and launched in 1876 for her owner John Leslie, who later sold her to the Albion Line. Marlborough disappeared during a voyage in January 1890, and has not been seen or heard from in over a century. Searches and investigations have yielded nothing conclusive, and the ship's ultimate fate, and that of her crew, remains unknown.