| Native Name: | Grafschaft Sayn-Wittgenstein-Karlsburg |
| Conventional Long Name: | County of Sayn-Wittgenstein-Karlsburg |
| Common Name: | Sayn-Wittgenstein-Karlsburg |
| Era: | Middle Ages |
| Status: | Vassal |
| Empire: | Holy Roman Empire |
| Government Type: | Principality |
| Year Start: | 1694 |
| Year End: | 1806 |
| Event Start: | Partitioned from S-W-Berleburg |
| Date Start: | 1607 |
| Event End: | Mediatised to Hesse |
| Event Post: | Annexed by Prussia |
| Date Post: | 1816 |
| P1: | Sayn-Wittgenstein-Berleburg |
| S1: | Grand Duchy of Hesse |
| Flag S1: | Flagge Großherzogtum Hessen ohne Wappen.svg |
| Capital: | Berleburg |
Sayn-Wittgenstein-Karlsburg was a cadet branch of Sayn-Wittgenstein-Berleburg, created by in 1694 Graf Casimir (ruled 1693–1741) for his younger brother Count Karl Wilhelm (1694–1749).[1] [2] [3] In 1806, the county was mediatised by the Grand Duchy of Hesse, while in 1816, it became annexed by Prussia. This cadet line of Sayn-Wittgenstein became extinct with the death of Count Christian Ludwig Karl zu Sayn-Wittgenstein-Karlsburg (1786-1867).[4]