K–12 is a 2019 American musical fantasy horror film written and directed by Melanie Martinez and co-directed by Alissa Torvinen. The film accompanies Martinez's second studio album of the same name and stars Martinez, Emma Harvey, Zión Moreno, Megan Gage, Zinnett Hendrix, Jesy McKinney, Marsalis Wilson, and Maggie Budzyna. The film follows Cry Baby (played by Martinez), a brave-hearted girl, and her charming best friend Angelita (Harvey), who make a bewitching pair as they embark on a mission to take down the oppressive schooling system of K–12.

K–12 was shown in select theaters for one day only on September 5, 2019, and was officially released on September 6, 2019, by Abramorama in North American territories and Atlantic Records internationally through YouTube. The film received favorable reviews from critics and fans alike, who praised its production values, themes, and songs, but criticism for its screenplay, acting and special effects.