三溴化砷是一种无机化合物，化学式为AsBr₃。

三溴化砷可由砷和溴在二硫化碳中回流得到：

2 As + 3 Br₂ → 2 AsBr₃

它也可利用三氧化二砷和溴在硫的存在下反应得到：

2 As₂O₃ + 3 S + 6 Br₂ → 4 AsBr₃ + 3 SO₂

Arsenic tribromide is the inorganic compound with the formula AsBr₃. This pyramidal molecule is the only known binary arsenic bromide. AsBr₃ is noteworthy for its very high refractive index of approximately 2.3. It also has a very high diamagnetic susceptibility. The compound exists as colourless deliquescent crystals that fume in moist air.