Luigi Illica (9 May 1857 – 16 December 1919) was an Italian librettist who wrote for Giacomo Puccini (usually with Giuseppe Giacosa), Alfredo Catalani, Umberto Giordano, Baron Alberto Franchetti and other important Italian composers. His most famous opera librettos are those for La bohème, Tosca, Madama Butterfly and Andrea Chénier.