Caesium hexafluorocobaltate(IV) is a salt with the chemical formula Cs2CoF6. It can be synthesized by the reaction of Cs3[(CoCl4)Cl] and fluorine. The salt contains rare example of cobalt(IV) complex, i.e. [CoF6]2-. It has cubic K2PtCl6 structure, with the lattice constant a = 8.91 Å, and the length of Co-F bond is 1.73 Å. The complex is ferromagnetic and the ground state of Co(IV) is T2g3Eg2.