Soyuz (Cyrillic: "Союз") is Russian for "Union", and was often used as an abbreviation for the "Union of Soviet Socialist Republics" (Soyuz Sovetskikh Sotsialisticheskikh Respublik) during the Communist era. In English, the term is left untranslated in the names of several Soviet-related concepts. These include:

• Soyuz programme, originally Soviet (now Russian) human spaceflight programme
• The Soyuz spacecraft, used in that program
• The Soyuz launch vehicle, is used to launch the spacecraft and others
• The Soyuz station established by members of the Soviet Antarctic Expeditions in Mac Robertson Land in Antarctica.
• The Soyuz, a team of Russian superheroes from DC Comics.