World of Tomorrow is an avant-garde animated science fiction short film series written, directed, produced, animated, and edited by Don Hertzfeldt. The series began with World of Tomorrow (2015), which was followed by World of Tomorrow Episode Two: The Burden of Other People's Thoughts (2017) and World of Tomorrow Episode Three: The Absent Destinations of David Prime (2020).

The series features the voice of Julia Pott, frequently alongside Hertzfeldt's four-year-old niece Winona Mae, who was recorded while drawing and playing. Her spontaneous, natural vocal reactions and questions were then edited into the story to create her character.

The first film was nominated for Best Animated Short Film at the 2015 Academy Awards. In 2020, Indiewire called it "one of the greatest short films in the history of movies." Of the "dreamy, beloved" ongoing series, The Film Stage noted, "Hertzfeldt has crafted what might be the crowning achievement of modern science fiction."