Dibromine pentoxide is the chemical compound composed of bromine and oxygen with the formula Br2O5.

It is a colorless solid that is stable below −20 °C.

Each BrO3 group is pyramidal with the bromine atom at the apex.

[2] Dibromine pentoxide can be prepared by reacting a solution of bromine in dichloromethane with ozone at low temperatures and recrystallized from propionitrile.

This inorganic compound–related article is a stub.