Willow Rosenberg is a fictional character created by Joss Whedon for the television series, Buffy the Vampire Slayer. She was portrayed by Alyson Hannigan, who also played the character in three episodes of the show's spin-off, Angel. Willow is the show's only major character known to be Jewish, and later was one of the most prominent lesbian characters in American television.

In 2007, AOL named her the second greatest witch in television history, behind Samantha Stephens of Bewitched. Willow is introduced in Buffy's first episode "Welcome to the Hellmouth", wherein Willow befriends new Sunnydale High student Buffy Summers (Sarah Michelle Gellar). Throughout the first season (1997) of Buffy, Willow assists Buffy in her duties as Slayer after Buffy's Watcher, Giles (Anthony Stewart Head) introduces her to the world of vampires and demons, and she pines for the love of best friend Xander (Nicholas Brendon) who is himself enamored of Buffy.

In the show's second season (1997-1998), after accepting that Xander does not return her feelings, Willow develops a relationship with werewolf and musician Oz (Seth Green). After the death of Giles' technopagan girlfriend Jenny Calendar (Robia LaMorte), Willow begins to follow in her footsteps by studying witchcraft. When Buffy's heroic vampire boyfriend Angel (David Boreanaz) loses his soul, and reverts to his evil 'Angelus' personality, Willow is the one to restore it magically in the second season finale "Becoming, Part Two".

The third season (1998-1999) sees Willow begin to become more heavily interested in magic; she, fellow witch Amy Madison (Elizabeth Anne Allen) and Buffy become the target of a witch-hunt, the evil vampire Spike (James Marsters) tries to make Willow cast a love spell on the vampire Drusilla (Juliet Landau), and she magically aids Buffy against the Mayor (Harry Groener) and rogue vampire Slayer Faith (Eliza Dushku). After Amy transforms herself into a rat, Willow keeps her as a pet. Willow and Oz briefly break up when she cheats on him with Xander; they reconcile and Willow eventually loses her virginity to him.

The third season also sees Willow encounter her evil vampire counterpart from another universe, and is shocked to see that this version of her is "kinda gay". Despite being accepted to universities such as Oxford, Harvard and Yale, Willow opts to attend UC Sunnydale so that she can continue to assist Buffy in the future.

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