William Henry Pratt (23 November 1887 – 2 February 1969), better known by his stage name Boris Karloff, was an English actor.

Karloff is best remembered for his roles in horror films and especially for his portrayal of Frankenstein's monster in Frankenstein (1931), Bride of Frankenstein (1935), and Son of Frankenstein (1939), which resulted in his immense popularity. His best-known non-horror role is as the Grinch, as well as the narrator, in the animated television special of Dr. Seuss's How the Grinch Stole Christmas! (1966). He also had a memorable role in the original Scarface (1932). For his contribution to film and television, Boris Karloff was awarded two stars on the Hollywood Walk of Fame.