| Native Name: | Grafschaft Sayn-Wittgenstein-Vallendar |
| Conventional Long Name: | County of Sayn-Wittgenstein-Vallendar |
| Common Name: | Sayn-Wittgenstein-Vallendar |
| Era: | Middle Ages |
| Status: | Vassal |
| Empire: | Holy Roman Empire |
| Government Type: | Principality |
| Year Start: | 1657 |
| Year End: | 1775 |
| Event Start: | Partitioned from S-W-Wittgenstein |
| Date Start: | 1657 |
| Event End: | Inherited by S-W-Hohnstein |
| Date End: | 1775 |
| P1: | Sayn-Wittgenstein-Wittgenstein |
| S1: | Sayn-Wittgenstein-Hohnstein |
| Capital: | Vallendar |
Sayn-Wittgenstein-Vallendar was a County of the Holy Roman Empire. It was created as a partition of Sayn-Wittgenstein-Wittgenstein, and was inherited by Sayn-Wittgenstein-Hohenstein in 1775.