Hala-'l Badr (or Hala-'l Bedr / Hallat al Badr, in Arabic: حلا البدر) is a volcano in northwestern Saudi Arabia at 27.25° N, 37.235° E. The volcano is of the cinder cone (or scoria-cone) type, and is on the northeast corner of the Thadra table mountain in the al Jaww basin, an erosional divide between Harrat ar-Rahah and Harrat al 'Uwayrid. Its eruption history is currently unknown, but geological studies have shown that Hallat al Badr erupted some time during the Holocene period, and the most recent lava flows were in the al Jaww basin.