Furneaux Cook, born John Furneaux Cook, was an English opera singer and actor best known for baritone roles in the comic operas of Gilbert and Sullivan and Alfred Cellier on the London stage. Cook appeared on stage for over 30 years in London, the British provinces and America.

Thomas Aynsley Cook was a British operatic bass-baritone of the Victorian era. Among others, he originated the role of José the Wolf in The Contrabandista by Arthur Sullivan and F. C. Burnand in 1867. He sang the role of Devilshoof in The Bohemian Girl, about 430 times.