Kolodin was born in Novovasilyevka, Soviet Union (now in Zaporizhia Oblast, Ukraine). In 1959, he graduated from Military Academy of Engineering and Radioengineering with gold medal. Kolodin then became an engineer-officer in the Soviet Armed Forces until his selection as a cosmonaut.^[3]

He was selected as a Soviet cosmonaut as part of the TsPK Group 2 in 1963. He entered cosmonaut training in January 1963 and completed training in January 1966. After completing his training, Kolodin served non-flight (backup) roles on the Voskhod 2, Soyuz 5, Soyuz 7, Soyuz 11, and Soyuz 12 spaceflights. He trained as test engineer of the 1st crew to fly on Soyuz 11 to 1st visit the Salyut 1 space station, but the entire crew was bumped when it was suspected that flight engineer Valeri Kubasov had contracted tuberculosis.^[3] The crew that replaced them perished during their mission when their capsule depressurized during preparations for re-entry.^[5]

Then he was in the 1st crew of the 1st visitation mission to Salyut 6 space station with Vladimir Dzhanibekov as a commander (future Soyuz 27). But after the unsuccessful mission of Soyuz 25 it was decided to include in the crews cosmonauts with the flight experience, so he was replaced by Oleg Makarov.

Kolodin later worked as a flight controller until his retirement on 20 April 1983. He was married and has one son.^[4]

He died in 2021.

• Photo
• Spacefacts biography of Pyotr Kolodin