Baikonur Cosmodrome Site 31

45°59′46″N 63°33′51″E / 45.99611°N 63.56417°E / 45.99611; 63.56417

Site 31/6

A Soyuz-2.1a rocket carrying the Soyuz MS-16 spacecraft as it was erected at Site 31/6
Launch site	Baikonur Cosmodrome
Location	Kazakhstan
Time zone	UTC+5 (AQTT)
Operator	Strategic Missile Forces, Russian Aerospace Forces, Roscosmos
Launch pad(s)	1
Orbital inclination range	49–99°
Launch history Status Active Launches 438 First launch 14 January 1961 R-7A Last launch 25 December 2024 Soyuz-2.1b (Resurs-P No.5) Associated rockets Current: Soyuz-2.1a, Soyuz-2.1b Retired: R-7A, Vostok, Voskhod, Polyot, Molniya, Soyuz, Soyuz-L, Soyuz-U, Soyuz-U2, Soyuz-FG

Baikonur Site 31, also designated as Site 31/6, is a launch complex at the Baikonur Cosmodrome in Kazakhstan. It serves as a key launch site, supporting Soyuz-2 launches for both crewed and uncrewed missions. The site was first utilized on 14 January 1961 for a test flight of the R-7A, an intercontinental ballistic missile on which the Soyuz rocket family was based. Since 2020, following Roscosmos' transition from the Soyuz-FG to the Soyuz-2 rocket for crewed missions, Site 31 has become the primary launch site for Soyuz flights to the International Space Station (ISS). This shift occurred after Site 1/5, also known as Gagarin's Start, failed to secure funding for upgrades to accommodate the slightly larger Soyuz-2 rocket. Before that, it only saw a handful of crewed flights when Site 1/5 was unavailable.