"Chapter 12: The Siege" is the fourth episode of the second season of the American streaming television series The Mandalorian. It was written by showrunner Jon Favreau and directed by Carl Weathers. It was released on Disney+ on November 20, 2020. In the episode, The Mandalorian returns to his friends Greef Karga and Cara Dune on Nevarro for repairs on his ship but is talked into a mission involving an old imperial base. The episode received positive reviews, in particular for the action sequences, Weathers' direction, and building sense of tension.

The second season of the American television series The Mandalorian is part of the Star Wars franchise, set after the events of the film Return of the Jedi (1983). It follows a bounty hunter trying to return "The Child" to the Jedi. The season was produced by Lucasfilm, Fairview Entertainment, and Golem Creations, with Jon Favreau serving as showrunner.