Steven Quartz Universe is the eponymous protagonist of the animated series Steven Universe and its epilogue series Steven Universe Future, created by Rebecca Sugar. Steven is a hybrid between a normal human being and a "Gem", a fictional race of alien beings that exist as magical gemstones projecting bodies of light. Voiced by Zach Callison, he debuted in the series' pilot episode and made his main series debut in the first episode, "Gem Glow".

Steven Universe is an American animated television series created by Rebecca Sugar for Cartoon Network. It tells the coming-of-age story of a young boy, Steven Universe, who lives with the Crystal Gems—magical, mineral-based aliens named Garnet (Estelle), Amethyst, and Pearl —in the fictional town of Beach City. Steven, who is half-Gem, has adventures with his friends and helps the Gems protect the world from their own kind. The pilot was first shown in May 2013, and the series ran for five seasons, from November 2013 to January 2019. The TV film Steven Universe: The Movie was released in September 2019, and an epilogue limited series, Steven Universe Future, ran from December 2019 to March 2020.