ACHIOR ā’ kĭ ôr (̓Αχίωρ, אחיאור, brother of light). An Ammonite chief captain who after giving a favorable report on the Israelites to Holofernes, the commander of the Assyrians, was left bound in Israelite territory. When Judith later showed Achior the severed head of Holofernes, he “believed firmly in God” and was converted to Judaism (Judt 5:5ff.; 6:1ff.; 14:6-10).