Cobalt(III) fluoride, also known as cobaltic fluoride and cobalt trifluoride, is a chemical compound. Its chemical formula is CoF. It contains cobalt in its +3 oxidation state. It contains cobalt and fluoride ions. It is used to add fluoride ion to other chemicals. It is a brown solid. It is a powerful oxidizing agent. It reacts with water to make hydrofluoric acid, oxygen, and cobalt(II) fluoride. It is made by reacting cobalt(II) chloride and fluorine at . Cobalt(II) oxide and cobalt(II) fluoride can be used instead of the cobalt(II) chloride. It is used to make some chemicals.