Caesium cadmium bromide (CsCdBr<sub>3</sub>) is a synthetic crystalline material. It belongs to the AMX<sub>3</sub> group (where A = alkali metal, M = bivalent metal, X = halogen ion). Unlike most other bromides, CsCdBr<sub>3</sub> is non-hygroscopic, giving it applications as an efficient upconversion material in solar cells. As a single crystal structure doped with rare-earth ions, it can be also used as active laser medium. It is highly transparent in the visible and infrared regions and can be used as a nonlinear optical crystal.
Caesium cadmium bromide with the formula Cs<sub>2</sub>CdBr<sub>4</sub> has also been synthesized.