| caption = The Joker on the cover of ''[[Batman: The Man Who Laughs]]''.<br>Art by [[Doug Mahnke]]
| real_name =
<!--Please do not replace with anything else. The mainstream comics have never given a real name.-->
| publisher = [[DC Comics]]
| debut = ''[[Batman (comic book)|Batman]]'' #1<br>(Spring 1940)<ref>Newsstand on-sale date April 25, 1940 per: {{cite web | title = The first ad for ''Batman'' #1 | publisher = DC Comics | url = http://www.goldenagebatman.com/batman1ad.htm | accessdate = 2006-10-23 }}</ref>
| affiliations = [[Injustice Gang]]<br/>[[Injustice League]]<br/>[[Secret Society of Super Villains|The Society]]<br/>[[Club of Heroes#Other versions|Club of Villains]]
| aliases = [[Red Hood]], Jack White<!--Do not change this to Jack Napier without discussing it on the talk page. Otherwise, it will be reverted.-->, Joseph "Joe" Kerr, Clem Rusty, Mr. Rekoj, Oberon Sexton, The Domino Killer