Vostok 6 (Russian: Восток-6, Orient 6 or East 6) was the first human spaceflight mission to carry a woman, cosmonaut Valentina Tereshkova, into space. This also made her the first civilian in space. The spacecraft was launched on June 16, 1963. Data was collected on the female body's reaction to spaceflight. Like other cosmonauts on Vostok missions, she maintained a flight log, took photographs, and manually oriented the spacecraft. Her photographs of the horizon from space were later used to identify aerosol layers within the atmosphere. The mission, a joint flight with Vostok 5, was originally conceived as being a joint mission with two Vostoks each carrying a female cosmonaut, but this changed as the Vostok program experienced cutbacks as a precursor to the retooling of the program into the Voskhod program. Vostok 6 was the last flight of a Vostok 3KA spacecraft.

It was revealed in 2004 that an error in the control program made the spaceship ascend from orbit instead of descending. Tereshkova noticed the fault on the first day of the flight and reported it to Sergey Korolev. The mistake was promptly repaired. Tereshkova entered the data that she got from the Earth into the descent program and landed safely.^{[citation needed]}

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