Carbonyl bromide, also known as bromophosgene, is a carbon oxohalide and a bromine analogue of phosgene, with the chemical formula COBr₂. It is a colorless liquid. Carbonyl bromide is a decomposition product of halon compounds used in fire extinguishers.

Carbonyl bromide is formed by the oxidation of carbon tetrabromide with sulfuric acid:

In contrast to phosgene, carbonyl bromide cannot be produced efficiently by halogenation of carbon monoxide. The bromination of carbon monoxide follows this equation:

But the process is slow at room temperature. Increasing temperature, in order to increase the reaction rate, results in a shift of the chemical equilibrium towards the reactants (since ΔH < 0 and ΔS < 0).

Carbonyl bromide slowly decomposes to carbon monoxide and elemental bromine even at low temperatures. It is also sensitive to hydrolysis, breaking down into hydrogen bromide and carbon dioxide.