Pyotr Ilyich Klimuk (Belarusian: Пётр Ільі́ч Кліму́к; Russian: Пётр Ильи́ч Климу́к; born July 10, 1942 in Komarovka , USSR (now in Belarus)) was a Soviet cosmonaut who made three flights into space.

Kliumuk attended the Leninski Komsomol Chernigov High Aviation School and entered the Soviet Air Force in 1964. The following year, he was selected to join the space programme.

His first flight was a long test flight on Soyuz 13 in 1973. This was followed by a mission to the Salyut 4 space station on Soyuz 18 in 1975.

From 1976 he became involved in the Intercosmos and made his third and final spaceflight on an Intercosmos flight with Polish cosmonaut Mirosław Hermaszewski on Soyuz 30.

He resigned from the cosmonaut team in 1978 to take up a position as the Assistant to the Chief of the Gagarin Cosmonaut Training Center. In 1991 he was promoted to Chief of that facility and remained in that post until retirement in 2003.

Klimuk is a graduate of the Gagarin Air Force Academy and the Lenin Military Political Academy .

He holds an extensive and impressive range of awards, including Hero of the Soviet Union (twice), the Order of Lenin (three times), the Polish Order of Krest Grunwald , a Tsiolkovski Gold Medal , a Gagarin Gold Medal , and a Gold Medal from the Polish Academy of Sciences. He was made an honorary citizen of the cities of Kaluga, Gagarin, and Dzhezkasgan.

He is the author of two books on human spaceflight: Beside the Stars, and Attack on Weightlessness.