The 2030s decade covers the period from 2030-2039.
Earth reaches a rating of "G" on the industrial scale with introductions such as the hovercar and a manned mission to Mars. Ares IV, despite its shortcomings, is crucial start in the planetary Human exploration. Charybdis follows, the third manned attempt to travel beyond the Sol system.
- The Xindi Civil War ends with the destruction of the Xindi homeworld, Xindus. The Xindi are scattered across the Delphic Expanse in what will someday be known as the Great Diaspora. (ENT: "The Xindi", "The Shipment", "Azati Prime")
- The Sphere-Builders start to make appearances to the survivors of the Xindi Great Diaspora, providing great help to them, like showing them habitable new planets and how to get essential resources. Because of this aid – what will be discovered as manipulation over a century later – and not revealing that they were the actual builders of the spheres, they are known as "The Guardians" by the Xindi. (ENT: "The Council")
- Sometime in the 2030s, a novelist from a planet orbiting Alnitak in Orion's Belt writes a classic theme to the words, "Let me help." He recommends those words even over "I love you." (TOS: "The City on the Edge of Forever")
- The hovercar begins to be used by the general public on Earth. (VOY: "The 37's")