Roy Harper is a superhero appearing in American comic books published by DC Comics. Roy is one of DC's most longstanding characters, originating in 1940s comics as Speedy, the teen sidekick of the superhero Green Arrow. Like his mentor Green Arrow, Roy is a world-class archer and athlete who uses his exceptional marksmanship to fight crime. Along with other prominent DC Comics superhero sidekicks, he goes on to become a core member of the superhero group the Teen Titans. As an adult, Roy casts off his Speedy identity to establish himself as the superhero Arsenal, and later takes on the name Red Arrow to symbolise his coming-of-age and having become an equal of Green Arrow as he joins the Justice League. In addition to continuing to serve on occasion as one of the Titans, Roy has had leading roles in the superhero groups the Seven Soldiers of Victory, the Outsiders, Checkmate, the Justice League, and the Outlaws.

The character first appeared as Green Arrow's teenage sidekick Speedy, a name by which he was known for over fifty years, in More Fun Comics #73 (November 1941) and was created by Mort Weisinger and George Papp. The character's modern-day version was an early member of the Teen Titans who later assumed the identity Arsenal in The New Titans #99 (July 1993), and became a member of the Justice League of America under the guise Red Arrow in Kingdom Come #2 (June 1996) or Justice League of America vol. 2 #7 (May 2007).