The National Gilbert & Sullivan Opera Company is an English professional repertory company that performs Gilbert and Sullivan's Savoy operas. Founded in 1995 to perform at the International Gilbert and Sullivan Festival, the company generally stages three or four productions each summer, giving up to 16 performances in Harrogate, North Yorkshire, and also touring.

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.