This essay explores Louisa May Alcott’s constructions of monstrous female figures in her works for adults and children. Kristina West analyzes texts, which include Alcott’s juvenile plays, her “blood-and-thunder” fiction for adults, and her novels for young people, to examine how Alcott repeatedly returns to her portrayal of witch-like heroines across texts and genres, ultimately validating a deviant model of femininity. Through an engagement with critical theory from Margrit Shildrick, Barbara Creed, and Kristin Sollée on the monstrous feminine and a brief consideration of Alcott’s family ties with the Salem witch trials, West considers how Alcott engages with stock figures such as the aged and crone-like witch in the woods in “The Witch’s Curse: An Operatic Tragedy” and the femme fatale with her demon lover in “Pauline’s Passion and Punishment,” but also explores both the expected punishment of deviant women and the success of female revenge and greed, such as in “Behind a Mask; or, a Woman’s Power.” This chapter further analyses less common constructions of the monstrous feminine, including the domestic witch, the emerging feminist, and destabilized gender norms, through Little Women and An Old-Fashioned Girl.