2000 AD crossovers are crossover stories appearing in British comic 2000 AD, its sister title the Judge Dredd Megazine, and other related output, such as novels, audio plays, films and role-playing games.

Judge Joseph Dredd is a fictional character created by writer John Wagner and artist Carlos Ezquerra. He first appeared in the second issue of 2000 AD (1977), which is a British weekly anthology comic. He is the magazine's longest-running character, and in 1990 he got his own title, the Judge Dredd Megazine. He also appears in a number of film and video game adaptations.