Soyuz 35 was a Soviet Soyuz 7K-T spacecraft launched to Salyut 6 in April 1980 with Leonid Popov and Valeri Ryumin. It delivered the fourth resident crew to the station, later returned the Soyuz 36 visiting crew, and left Popov and Ryumin to return on Soyuz 37 after a 184-day expedition.