John D. Rockerduck is a fictional character from the Duck universe. He is one of Scrooge McDuck's main rivals. His name is a play on that of John D. Rockefeller, the American capitalist and philanthropist. Though a relatively obscure character in the United States, Rockerduck is an example of a character who has become notable in the foreign market, particularly in stories produced for the Italian market.

Rockerduck was created by Carl Barks, who used him in one story: Boat Buster, first published in December, 1961. In that story, he was portrayed as an oil tycoon who argued with Scrooge McDuck, portrayed in that story as another oil tycoon, over which one of them made the best gasoline. To settle this, Scrooge and John agreed each one to enter a boat at an upcoming race. Scrooge was so confident of his victory he said he could win regardless of who was driving his boat. Trying to prove his point, Scrooge randomly picked somebody from the crowd watching their argument but lost confidence when the somebody happened to be Donald Duck. To increase his chances of victory, Scrooge saw to it that all other boats in the race (there were a hundred boats counting Donald's and John's) were powered by his gasoline. Near the end, several boats (Donald's included) crashed and a loose motor pushed him into the finish line in the first place. Scrooge claimed victory but Rockerduck pointed out they first must find out whose gasoline was powering that motor. Despite the odds being for Scrooge, the motor happened to be the one powered by John Rockerduck's gasoline. Rockerduck was jumping in celebration while an enraged Scrooge chased Donald.

Carl Barks (March 27, 1901 – August 25, 2000) was an American Disney Studio illustrator and comic book creator, who invented Duckburg and many of its inhabitants, such as Scrooge McDuck (1947), Gladstone Gander (1948), the Beagle Boys (1951), The Junior Woodchucks (1951), Gyro Gearloose (1952), Cornelius Coot (1952), Flintheart Glomgold (1956), John D. Rockerduck (1961) and Magica De Spell (1961). The quality of his scripts and drawings earned him the nicknames The Duck Man and The Good Duck Artist. Writer-artist Will Eisner called him "the Hans Christian Andersen of comic books."

In 1987, Barks was one of the three inaugural inductees of the Will Eisner Comic Book Hall of Fame.

Barks was born in Merrill, Oregon to William Barks and his wife Arminta Johnson. He had an older brother named Clyde. Barks once stated that his paternal ancestors were Dutch and his maternal ancestors were Scottish. His paternal grandparents were David Barks and his wife Ruth Shrum. His maternal grandparents were Carl Johnson and his wife Suzanna Massey, but little else is known about his ancestors. Barks was the descendant of Jacob Barks who came to Missouri from North Carolina around 1800. They lived in Marble Hill in Bollinger County. Jacob Barks' son Isaac was the father of the David Barks noted above. Source 1850 census, Goodspeed's History of Southeast Missouri, 1888. Find a Grave.

Scrooge McDuck is a cartoon character created in 1947 by Carl Barks and licensed by The Walt Disney Company. Scrooge is an elderly Scottish anthropomorphic white duck with a yellow-orange bill, legs, and feet. He typically wears a red or blue frock coat, top hat, pince-nez glasses, and spats and is portrayed in animations as speaking with a slight Scottish accent, also sometimes known as a Scottish burr. His dominant character trait is his thrift, and within the context of the fictional Disney universe, he is the Earth's richest person.

Named after Ebenezer Scrooge from the 1843 novel A Christmas Carol, Scrooge is a wealthy Scottish business magnate and tycoon. He was in his first few appearances characterized as a greedy miser and antihero (as Charles Dickens' original Scrooge was), but in later comics and animated shorts and the modern day he is more often portrayed as a charitable and thrifty hero, adventurer, explorer and philanthropist. Scrooge was created by Barks as a comic book character originally as an antagonist for Donald Duck, first appearing in the 1947 Four Color story "Christmas on Bear Mountain" (#178). The character soon became so popular that McDuck soon became a major figure of the Duck universe. In 1952 he was given his own comic book series, called Uncle Scrooge, which still runs today. Scrooge was most famously drawn by his creator Carl Barks, and later by Don Rosa. Comics have remained Scrooge's primary medium, although he has also appeared in animated cartoons, most extensively in the television series Duck Tales (1987–1990).