Richard "Dick" Milhous Dastardly is a fictional character and antagonist who appeared in various animated series by Hanna-Barbera Productions. Dastardly's most famous appearances are as a main character in the series Wacky Races (his initial appearance) and its spin-off, Dastardly and Muttley in Their Flying Machines. He is essentially a caricature of the English actor Terry-Thomas[citation needed], and of Professor Fate, a comic villain played by Jack Lemmon in the film The Great Race.

The character was voiced originally by Paul Winchell, then by Rob Paulsen and currently by Jim Cummings. Winchell and Cummings have shared another role: Tigger from Winnie-the-Pooh stories. Winchell's facial structures were caricatured in the related character design as well. In various scenes, Dastardly would utter his catchphrases, "Drat, and double drat!" or "Drat, drat and triple drat!" and even "Curses, foiled again!" His other main catchphrase was, "Muttley, do something!"