The International Gilbert and Sullivan Festival was founded in 1994 by Ian Smith and his son Neil and is held every summer in England. The two- or three-week Festival of Gilbert and Sullivan opera performances and fringe events attracts thousands of visitors, including performers, supporters, and G&S enthusiasts from around the world. The Festival was held in Buxton, Derbyshire, from 1994 to 2013, and from 2014 to 2022, it was held in Harrogate, North Yorkshire, usually with a week in Buxton preceding the main part of the Festival. The entire Festival returned to Buxton in 2023.

Gilbert and Sullivan refers to the Victorian-era theatrical partnership of the dramatist W. S. Gilbert (1836–1911) and the composer Arthur Sullivan (1842–1900) and to the works they jointly created. The two men collaborated on fourteen comic operas between 1871 and 1896, of which H.M.S. Pinafore, The Pirates of Penzance and The Mikado are among the best known.