Aleksandr Sergeyevich Ivanchenkov (Russian: Алекса́ндр Серге́евич Иванче́нков; born 28 September 1940 ) is a retired Soviet cosmonaut who flew as Flight Engineer on Soyuz 29 and Soyuz T-6, he spent 147 days, 12 hours and 37 minutes in space.
Ivanchenkov first flew on Soyuz 29 in 1978 to the Salyut 6 space station. It was the fifth mission, the fourth successful docking, and the second long-duration crew for the orbiting station. Commander Vladimir Kovalyonok and flight engineer Ivanchenkov established a new space-endurance record of 139 days.
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