William Hanna was an American animator, director, producer, voice actor, and cartoon artist.

In 1937, while working at Metro-Goldwyn-Mayer,  Hanna met Joseph Barbera. In 1957, they co-founded Hanna-Barbera, which became the most successful television animation studio in the business, producing programs such as The Flintstones, The Huckleberry Hound Show, The Jetsons, Scooby-Doo, The Smurfs, and Yogi Bear.

Hanna and Barbera won seven Academy Awards and eight Emmy Awards. Their cartoons have become cultural icons, and their cartoon characters have appeared in other media such as films, books, and toys. Hanna-Barbera's shows had a worldwide audience of over 300 million people in their 1960s heyday, and have been translated into more than 28 languages.

William Hanna was inducted into the Television Academy Hall of Fame with his producing partner Joseph Barbera in 1994.