Soyuz 19 was the Soviet Soyuz 7K-TM spacecraft flown by Alexei Leonov and Valeri Kubasov on the Apollo-Soyuz Test Project. It docked with Apollo CSM-111 in the first international crewed space mission and returned its crew safely near Baikonur on July 21, 1975. No serial number is asserted because the cited NASA mission record does not publish one.