The Clan McDuck is a fictional Scottish clan of cartoon ducks from which Disney character Scrooge McDuck is descended. Within the Donald Duck universe, the clan is related to the American Duck family through the marriage of Hortense McDuck and Quackmore Duck, the parents of Donald Duck. The seat of Clan McDuck is McDuck Castle (alternately called Castle McDuck) which is located in Dismal Downs, somewhere in Rannoch Moor, a non-fictional location within Scotland. The nearest village is the fictional MacDuich.

In 1942, five years before the creation of Scrooge McDuck as a character, the Disney corporation created and registered a yellow, red, and green tartan pattern called “MacDuck Final Version” and used it to sell war bonds during World War II. Subsequent versions have been designed for comics and cartoon characters but not officially registered.