"Guardians of the Lost Library" is a 1993 comic book story made by Don Rosa for The Walt Disney Company, mentioned by Comics Buyer's Guide as "possibly the greatest comic book story of all time". Although afraid at the time of its creation of cramming too many historical details into the story, Rosa himself mentions in Uncle Scrooge #383 that in fan mail he receives to this day, "Guardians of the Lost Library" to his own surprise is often referred to as "'the best Rosa story' or 'the best Duck story' or even 'the best comic book story' (?!!) that fans say they've ever read."

Keno Don Hugo Rosa, known as Don Rosa, is an American comic book writer and illustrator known for his Disney comics stories about Scrooge McDuck, Donald Duck, and other characters which Carl Barks created for Disney-licensed comic books, first published in America by Dell Comics. Many of his stories are built on characters and locations created by Barks; among these was his first Duck story, "The Son of the Sun" (1987), which was nominated for a Harvey Award in the "Best Story of the Year" category.