Doomsday Clock is a 2017–2019 superhero comic book limited series published by DC Comics, written by Geoff Johns with art by penciller Gary Frank and colorist Brad Anderson. The series concludes a tangential story established in the New 52 and DC Rebirth, and it is a sequel to the 1986–1987 graphic novel Watchmen by Alan Moore, Dave Gibbons and John Higgins, making it the first official crossover between Watchmen and the mainstream DC Universe.
At the time, DC co-publisher Dan DiDio promoted Doomsday Clock as an official "sequel" to Watchmen. However, series writer and DC Chief Creative Officer Geoff Johns declined to characterize it as such, viewing it as a "standalone" story.
The series's debut issue was published on November 22, 2017, and the final issue was published on December 18, 2019.