Prince Valiant in the Days of King Arthur, often simply called Prince Valiant, is an American comic strip created by Hal Foster in 1937. It is an epic adventure that has told a continuous story during its entire history, and the full stretch of that story now totals more than 4000 Sunday strips. The strip appears weekly in more than 300 American newspapers, according to its distributor, King Features Syndicate.

A comic strip is a sequence of cartoons, arranged in interrelated panels to display brief humor or form a narrative, often serialized, with text in balloons and captions. Traditionally, throughout the 20th and into the 21st century, these have been published in newspapers and magazines, with daily horizontal strips printed in black-and-white in newspapers, while Sunday papers offered longer sequences in special color comics sections. With the advent of the internet, online comic strips began to appear as webcomics.