Soyuz 37 was a Soviet Soyuz 7K-T spacecraft launched to Salyut 6 in July 1980 with Viktor Gorbatko and Pham Tuan for the sixth Intercosmos visiting mission. After the visiting crew returned on Soyuz 36, Soyuz 37 remained at Salyut 6 and later returned the long-duration Soyuz 35 resident crew of Leonid Popov and Valeri Ryumin in October 1980.