Robert F. "Toby" Fox is an American video game developer and composer. He is best known for developing the role-playing video game Undertale, which garnered acclaim and has received nominations for a British Academy Game Award, three Game Awards and D.I.C.E. Awards. He is also the creator and head of the ongoing development of Deltarune, which contains many characters and features from Undertale, and has also garnered significant praise.
Fox's early work consisted primarily of composing music, notably for the webcomic Homestuck, and, following the success of Undertale, he went on to compose music for a number of other independent video games. Other notable works include contributing to the soundtracks of Super Smash Bros. Ultimate and the Pokémon video games.