Bosor was an ancient Biblical Levitical city and one of the three Trans-Jordanian Cities of Refuge named in the Mosaic Law. It was located in Gilead, and was conquered by Judas Maccabeus.  It is sometimes identified with modern-day Busr el-Bariri.
Josephus commented on its conquest.
- 1 Maccabees 5:26, 36