The Soviet space program was the national space program of the former Union of Soviet Socialist Republics (USSR), active from 1955 until the dissolution of the Soviet Union in 1991. The Soviet space program served as an important marker of Soviet claims to its global superpower status.

Soviet investigations in rocketry began with the formation of a research laboratory in 1921, but these efforts were hampered by the devastating war with Germany. Competing in the Space Race with the United States and later with the European Union and China, the Soviet program was notable in setting many records in space exploration, including the first intercontinental missile that launched the first satellite and sent the first animal into Earth orbit in 1957, and placed the first human in space in 1961. In addition, the Soviet program also saw the first woman in space in 1963 and a cosmonaut performing the first spacewalk in 1965. Other milestones included computerized robotic missions exploring the Moon starting in 1959, with the second mission being the first to reach the surface of the Moon, recording the first image of the far side of the Moon, and achieving the first soft landing on the Moon. The Soviet program also achieved the first space rover deployment in 1966 and sent the first robotic probe that automatically extracted a sample of lunar soil and brought it to Earth in 1970. The Soviet program was also responsible for leading the first interplanetary probes to Venus and Mars and made successful soft landings on these planets in the 1960s and 1970s. It put the first space station into low Earth orbit in 1971 and the first modular space station in 1986. Its Interkosmos program was also notable for sending the first citizen of a country other than the United States or Soviet Union into space.

After WWII, the Soviet and US space programs both utilised German technology in their early efforts. Eventually, the program was managed under Sergei Korolev, who led the program based on unique ideas derived by Konstantin Tsiolkovsky, sometimes known as the father of theoretical astronautics. Contrary to its American, European, and Chinese competitors, who had their programs run under a single coordinating agency, the Soviet space program was divided and split among several internally competing design bureaus led by Korolev, Kerimov, Keldysh, Yangel, Glushko, Chelomey, Makeyev, Chertok and Reshetnev.