Vostok 2 (Russian: Восток-2, Orient 2 or East 2) was a Soviet space mission which carried cosmonaut Gherman Titov into orbit for a full day in order to study the effects of a more prolonged period of weightlessness on the human body. Titov orbited the earth over 17 times, exceeding the single orbit of Yuri Gagarin on Vostok 1 − as well as the suborbital spaceflights of American astronauts Alan Shepard and Gus Grissom aboard their respective Mercury-Redstone 3 and 4 missions. Indeed, Titov's number of orbits and flight time would not be surpassed by an American astronaut until Gordon Cooper's Mercury-Atlas 9 spaceflight.

The flight was an almost complete success, marred only by a heater that had inadvertently been turned off prior to liftoff and that allowed the inside temperature to drop to 50 °F (10 °C), a bout of space sickness, and a troublesome re-entry when the reentry module failed to separate cleanly from its service module.

Unlike Yuri Gagarin on Vostok 1, Titov took manual control of the spacecraft for a short while. Another change came when the Soviets admitted that Titov did not land with his spacecraft. Titov would claim in an interview that he ejected from his capsule as a test of an alternative landing system; it is now known that all Vostok program landings were performed this way.

Vostok (Russian: Восто́к, IPA: [vɐˈstok], Orient or East) may refer to: