The posters in the Harold A. Kanthor Collection of Gilbert and Sullivan are a diverse group representing advertisements for specific productions or theatrical companies. They provide a varied range of graphic design as well as a historical context for understanding the theatrical evolution of Gilbert and Sullivan productions. The posters are subdivided by specific operas, with three categories repeated throughout each opera designation: Production, Adaptation, and Film. Within each designation, posters are described in chronological order. Posters for specific operas are followed by posters generically produced for the D'Oyly Carte Company, posters for non-theatrical advertising, posters for films not produced for specific operas, and posters for other types of productions or events.