| Qasr Bayir قصر بيير | |
| Location: | Jordan |
| Coordinates: | 30.7619°N 36.6792°W |
| Map Type: | Jordan |
| Type: | Desert castle |
| Built: | 743 CE |
| Builder: | Al-Walid II |
| Materials: | Stone |
| Condition: | Ruins |
Qasr Bayir (Arabic: قصر بيير) is a desert castle built in 743 CE by Prince Walid bin Yazid. It is found in the desert of Jordan and it was destroyed in 1931.
In 743, during the Umayyad period, the future caliph Al-Walid II had the castle built in what is today the Jordanian badiya (desert). The structure was 70 meters long and was built of large sandstone blocks. It was destroyed in 1931 by Beake Pasha and the stone blocks were used to construct an Arab Legion outpost.