| South Moluccas |
|
| South Russia |
|
| South Sudan |
|
| Southern Nigeria |
|
| Southern Rhodesia |
|
| Southern Rhodesia- Revenue Stamps |
|
| South-West Africa |
|
| Soviet Union, USSR |
|
| Soviet Union, USSR- Revenue Stamps |
|
| Spain |
|
| Spain- Barcelona Municipality |
|
| Spain- Private Post Offices |
|
| Spain- Revenue Stamps |
|
| Spain, Civil War |
|
| Spain, Colonies |
|
| Spanish colonies |
|
| Spanish Guinea |
|
| Spanish Morocco |
|
| Spanish Sahara |
|
| Spanish West Africa |
|