Uranium(III) bromide is an inorganic compound with the chemical formula UBr<sub>3</sub>. It is radioactive.
Uranium(III) bromide can be obtained by the reaction of uranium metal or uranium(III) hydride and hydrogen bromide, or it can also be prepared by the thermal decomposition of NH<sub>4</sub>UBr<sub>4</sub>÷1.5CH<sub>3</sub>CN÷6H<sub>2</sub>O. It is difficult to synthesize due to its rapid oxidation in both water and air.