Begtse (; "Begtse the Great Coat of Mail") is a dharmapala and the lord of war in Tibetan Buddhism, originally a pre-Buddhist war god of the Mongols.
The name Begtse is a loanword from Mongolian, meaning "coat of mail". He is also given the name and epithet Jamsaran, meaning "Great Coat of Mail", which is a translation of the Mongolian.
Begtse has red skin and orange-red hair, two arms (as opposed to other Mahākālas, who have four or six), three blood-shot eyes and is wielding a sword in his right hand. He also holds a human heart in his right hand. In the stock of his right arm, he holds a bow and arrow and a halberd with bannet. He wears a chainmail shirt, which gave rise to his name, Jamsaran. He wears a Mongolian helmet with a crown of five skulls and four banners in the back. He is also accompanied by his consort, Rikpay Lhamo, and his main general, Laihansorgodog. They are surrounded by Jamsaran's satellites, the twenty-nine butchers.
Jamsaran is represented in Mongolian, and to a lesser extent Tibetan, Cham dance.