Nightwing is the name of several superheroes appearing in American comic books published by DC Comics. The most prominent is Dick Grayson, who takes the name when he leaves his role as Batman's partner and sidekick Robin in his adulthood.
Although Nightwing is commonly associated with Batman, the title and concept have origins in classic Superman stories. The original Nightwing was an identity assumed by Superman when stranded on the Kryptonian city of Kandor with Jimmy Olsen. Drawing inspiration from Batman and Robin, the two protect Kandor as the superheroes Nightwing and Flamebird. Following the Crisis on Infinite Earths and Zero Hour: Crisis in Time! continuity reboots in 1985 and 1994, respectively, Nightwing was reimagined as a legendary vigilante from Krypton whose story inspires Dick Grayson's choice of name when he leaves behind his Robin identity.
Other stories set among the Batman family of characters have seen acquaintances and friends of Grayson briefly assume the title, including his fellow Robin alumnus Jason Todd. Meanwhile, Superman stories have seen Superman's adopted son Chris Kent and Power Girl take up the name for brief turns as Nightwing. Various other characters have taken the name in stories set outside DC's main continuity as well.