Daniel "Oz" Osbourne is a fictional character created by Joss Whedon for the television series Buffy the Vampire Slayer. The character is portrayed by Seth Green. Green also portrays the character in one episode of the spin-off series Angel.

"Retreat" is the sixth story arc of the Buffy the Vampire Slayer Season Eight series of comic books, based upon the television series of the same name, and is written by television screenwriter Jane Espenson. The story returns the action to the central plot of vampire Slayer Buffy Summers and her friends in the fight against the masked person Twilight, alongside his followers Amy Madison and Warren Mears. This story arc features the character of Oz, a werewolf who is Buffy's schoolfriend and Willow Rosenberg's ex-boyfriend, who last appeared canonically in the television series' fourth season.