| Social Catholicism | | Country |
| Social Democratic Women's Union | | Country |
| Social Security Act | | Country |
| Socialism | | Country |
| Socialist Cooperation | | Country |
| Socialist Education in the nation | | Country |
| Socialist Land Reform | | Country |
| Socialist Pioneers | | Country |
| Socialist Unification | | Country |
| Socialist Welfare | | Country |
| Socialist Youth | | Country |
| Société Africaine d'Explosifs Congo | | Materiel Manufacturer |
| Societé Anonyme Belge d'Exploitation de la Navigation Aérienne | | Industrial Concern |
| Société Commerciale des Transports et des Ports | | Industrial Concern |
| Société Française Radio-Électrique | | Industrial Concern |
| Société Générale de Belgique | | Industrial Concern |
| Société Internationale Forestière et Minière du Congo | | Industrial Concern |
| Société Nationale des Chemins de fer du Congo | | Country |
| Sold Baluchistan | | Country |
| Sold Dreadnoughts | | Country |
| Sold Obsolete Escort Ships | | Country |
| Sold Parts of India to Private Investors | | Country |
| Soldiers of the Steppe | | Country |
| Soldiers Training in Britain | | Country |
| SOMUA | | Materiel Manufacturer |
| SOMUA | | Materiel Manufacturer |
| SOMUA | | Materiel Manufacturer |
| Sophistry and Science | | Country |
| South African Railways | | Industrial Concern |
| South Manchuria Railway Company | | Industrial Concern |
| Southern Expedition | | Country |
| Soviet Advisors | | Country |
| Soviet Cooperation Programs | | Country |
| Soviet Industrial Aid | | Country |
| Soviet Military Advisors | | Country |
| Soviet Military Cooperation | | Country |
| Soviet Military Cooperation | | Country |
| Soviet Pilot Schools | | Country |
| Soviet Railways | | Industrial Concern |
| Soviet Recovery Aid | | Country |
| Soviet Technical Teams | | Country |
| Soviet Threat | | Country |
| Soviet-German Friendship | | Country |
| Spanish Civil War Commitments | | Country |
| Spanish Civil War intervention | | Country |
| Spanish Civil War intervention | | Country |
| Special Forces | | Country |
| Specialized Desert Training | | Country |
| Specialized Terrain Training | | Country |
| Spirit of Azadi | | Country |
