Batman: White Knight is an American comic book published by DC Comics. The eight-issue limited series, written and illustrated by Sean Murphy, began monthly publication in October 2017 and concluded in May 2018. In the series, the Joker is seemingly cured of his madness and sets out to become a politician under his real name of Jack Napier, seeking to change his public image as a "villain" and save Gotham City from Batman, whom he views as the real enemy of the city.

A sequel titled Batman: Curse of the White Knight ran from July 24, 2019 to March 25, 2020. A second sequel, Batman: Beyond the White Knight, began publication on March 29, 2022 and concluded on February 14, 2023.

Batman, Batgirl and Nightwing pursue the Joker in a reckless high-speed chase through Gotham City, causing significant property damage and nearly killing multiple bystanders. Batman eventually corners the Joker and chases him on foot into a pharmaceutical warehouse. He beats the Joker and is goaded into force-feeding him a bottle of unknown medication which turns him sane.

Batman's allies watch in disgust and footage of the assault is leaked to the news. In light of these events, Gotham begins to debate over whether Batman is doing more harm than good. Bruce's recent violence stems from Alfred being near death, kept alive only by Freeze-Tech. The Joker, now using his real name, Jack Napier, wins a case against the GCPD for insufficient evidence and for non-intervention in his beating.

Freed, Napier visits Harley Quinn, who attacks him and insists he is not himself. Saved by a second Harley, Napier learns she is the original but was replaced. When the Joker's obsession with Batman culminated in Jason Todd's torture, Quinzel left him to try and help save Todd's life. During a subsequent bank robbery, the Joker had unwittingly adopted a hostage, Marian Drews, as the new Harley Quinn.

Bruce and Victor Fries develop a treatment for their loved ones' cryogenic illnesses. Despite not being fully tested, Fries attempts to use the new system to resuscitate his wife, Nora. Having anticipated this, Bruce hooks the system up to Fries' suit, curing him of his own illness, but aging him horribly. Later, Bruce is left shaken by the discovery that many of his fellow billionaires have been profiting off of Batman's destructive battles with criminals by purchasing destroyed properties then flipping them after they are repaired by the city, along with the revelation that his father Thomas Wayne funded Fries Sr. to create Freeze-Tech, circumventing U.S. laws by tunneling under Gotham's German embassy. Fries Sr. later cut ties with Thomas to build a superweapon.

Now running for councilman, Napier funds construction of a library in the impoverished district of Backport and befriends Duke Thomas, an ex-GCPD officer who runs a local youth group. Using the Mad Hatter's technology, Napier mind controls Clayface into servitude. He then drugs Batman's rogues gallery with drinks laced with Clayface's essence which he can use to control them by proxy.

Making the villains rampage across the city as a distraction, Napier gains access to restricted documents and discovers a hidden tax fund for Batman's collateral damage. In an attempt to move the villains to a less-populated area, Batman baits them into attacking Napier's Backport library, thinking that they would not attack Napier's property; the villains proceed to raze the library and damage the neighborhood. Critically injured, Bruce returns to the Batcave and collapses at Alfred's bedside. He wakes to find Alfred has used his life-support to stabilize Bruce at the cost of his own life.