William Boyd "Bill" Watterson II is an American cartoonist and the author of the influential comic strip Calvin and Hobbes. His career as a syndicated cartoonist ran from 1985 to 1995. He retired at the end of 1995 with a short statement to newspaper editors and his fans that he felt he had achieved all he could in the comic strip medium.

During the early years of his career, he produced several drawings and additional contributions for Target: The Political Cartoon Quarterly. Watterson is known for his views on licensing and comic syndication, as well as his reclusive nature.

Born in Washington, D.C., he grew up in Chagrin Falls, Ohio. The suburban Midwestern United States setting of Ohio was an inspiration for the setting of Calvin and Hobbes. As of January 2024, Watterson lives in Cleveland Heights, Ohio.