Beast (or The Beast), Dr. Henry Philip "Hank" McCoy, is a fictional character, a Marvel Comics superhero, and a member of the mutant team of superheroes known as the X-Men. Created by writer Stan Lee and artist/co-writer Jack Kirby, the character first appeared in X-Men #1 (September 1963).

When first introduced, Beast — a mutant — possesses ape-like superhuman physical strength and agility and oversized hands and feet, though he otherwise appears to be a normal human being. Throughout his story, Beast undergoes progressive latent transformations to his physiology, permanently gaining increasingly animalistic physical characteristics. These include blue fur, feline facial features, pointed ears, fangs, and claws. His physical power increases to even greater levels, as do his senses.

Despite his savage appearance, he is a brilliant man of the arts and sciences; he is a world authority on biochemistry and genetics, the X-Men's medical doctor, and the science and mathematics instructor at the Xavier Institute (the X-Men's headquarters and school for young mutants). He is also a mutant political activist. Fighting his bestial instincts and fears of social rejection, Beast dedicates his physical and mental gifts to the creation of a better world for man and mutant. He also has a witty sense of humor.

One of the original X-Men, Beast has appeared consistently in X-Men-related comics throughout the years. He has also been a member of the "all-star" teams the Avengers and Defenders. He is played by Kelsey Grammer in X-Men: The Last Stand.