A fictional character, a superhero who appears in comic books published by Marvel Comics. Born James Howlett and commonly known as Logan, Wolverine is a mutant who possesses animal-keen senses, enhanced physical capabilities, three retracting bone claws on each hand and a healing factor that allows him to recover from virtually any wound, disease, or toxin at an accelerated rate. The healing factor also slows down his ageing process, enabling him to live beyond a normal human lifespan. His powerful healing factor enabled the supersoldier programme Weapon X to bond the near-indestructible metal alloy adamantium to his skeleton and claws without killing him. He is most often depicted as a member of the X-Men, Alpha Flight, or later the Avengers.

The character first appeared in the last panel of The Incredible Hulk #180 (his first full appearance is in issue #181, November 1974) and was created by writer Len Wein and Marvel art director John Romita, Sr., who designed the character, and was first drawn for publication by Herb Trimpe. Wolverine later joined the X-Men's "All New, All Different" roster in Giant-Size X-Men #1 (May 1975). X-Men writer Chris Claremont played a significant role in the character's subsequent development, along with artist/writer John Byrne, who insisted on making the character older than the other X-Men. Artist Frank Miller collaborated with Claremont and helped to revise the character with a four-part eponymous limited series from September to December 1982 in which Wolverine's catchphrase, "I'm the best there is at what I do, but what I do best isn't very nice," debuted.

Wolverine was typical of the many tough, anti-authority, antiheroes that emerged in American popular culture after the Vietnam War; his willingness to use deadly force and his brooding nature became standard characteristics for comic book anti-heroes by the end of the 1980s. As a result, the character became the clear favourite for fans of the increasingly popular X-Men franchise. Wolverine has been featured in his own solo comic since 1988 and has been a central character in most X-Men adaptations, including animated television series, video games, and the live-action 20th Century Fox X-Men film series, in which he is portrayed by Hugh Jackman. In May 2008, Wolverine was ranked #1 out of Wizard magazine's Top 200 Comic Book Characters of All Time and was ranked as the 4th Greatest Comic Book Character by Empire magazine in July 2008. On their list of the 100 Greatest Fictional Characters, Fandomania.com ranked Wolverine at #21. In May 2011, Wolverine was ranked 4th on IGN's Top 100 Comic Book Heroes.