| Wartenstein | |
| Built: | about 1206 |
| Type: | hill castle |
| Condition: | ruin |
| Location: | Pfäfers |
| Coordinates: | 46.9943°N 9.5105°W |
| Map Type: | Canton of St. Gallen#Switzerland |
| Code: | CH-SG |
Wartenstein Castle is a castle in the municipality of Pfäfers of the Canton of St. Gallen in Switzerland. It is a Swiss heritage site of national significance.[1]