Frankelda's Book of Spooks (Spanish: Los Sustos Ocultos de Frankelda) is a Mexican stop motion animated television series created by brothers Arturo and Roy Ambriz Rendón and produced by the animation studio Cinema Fantasma for Cartoon Network Latin America and HBO Max.

Frankelda, a mysterious ghostwriter, tells tales of terror with the assistance of her grumpy enchanted book Herneval, primarily focused on children encountering supernatural entities such as gnomes, witches, sirens and the Coco collectively known as "Spooks", that rely on human fear to survive.

Frankelda's Book of Spooks was initially pitched as a small web series with a four-minute pilot episode being released in 2019 on the Cartoon Network YouTube channel, inspired by Tales from the Crypt and The Storyteller.

The series is being positioned as a "calling card" for Cinema Fantasma, with the Ambriz brothers describing Frankelda's extended backstory as offering enough depth as a hook for potential later seasons or a movie.

[2] A spinoff exploring the backstory of Frankelda and Herneval further was announced at the Pixelatl 2022 festival, titled Frankelda and the Prince of Spooks,[3] later being confirmed as a movie when it was announced it would be featured as a work in progress at the 2023 Annecy International Animation Festival as part of a showcase of Mexican animation.