This companion provides a definitive and cutting-edge guide to the study of imaginary and virtual worlds across a range of media, including literature, television, film, and games. From the Star Trek universe, Thomas More's classic Utopia, and J. R. R. Tolkien's Arda, to elaborate, user-created game worlds like Minecraft, contributors present interdisciplinary perspectives on authorship, world structure/design, and narrative. The Routledge Companion to Imaginary Worlds offers new approaches to imaginary worlds as an art form and cultural phenomenon, explorations of the technical and creative dimensions of world-building, and studies of specific worlds and worldbuilders.