Llewellyn "Lyn" Cadwaladr (1857 – 7 February 1909) was a Welsh operatic tenor who originated roles in, or starred in early tours of, comic operas and operettas of Gilbert and Sullivan, Solomon and Stephens, Robert Planquette and others in the Victorian era, often in America for the D'Oyly Carte Opera Company. He was touring as Ralph in H.M.S. Pinafore when he was asked to create the role of Frederic in the ad hoc 1879 British copyright performance of The Pirates of Penzance.