Quagmire McDuck is one of Walt Disney's comic book characters. He was first mentioned by Carl Barks in the story "The Heirloom Watch", published on June, 1955.

Quagmire was a descendant of Hugh McDuck and older brother of Dingus McDuck. He had inherited his ancestor's silver watch. Apparently he was wealthy enough to have his own estate. When he died his watch was inherited by his nephew Fergus McDuck. His estate remained unclaimed until the time that his grand-nephew Scrooge McDuck, by then owner of the watch, tried to claim it.