Copper(I) fluoride, with the chemical formula CuF, is an inorganic compound containing copper in its +1 oxidation state, bonded to one fluoride ion.

Copper can exist in various oxidation states, including +1 and +2, but copper(I) compounds tend to be less stable compared to copper(II) compounds. Fluorine is a highly reactive element, and forming stable compounds with metals in higher oxidation states can be challenging.

While copper(I) fluoride has been theoretically studied and predicted to exist, it is not commonly encountered in practical applications due to its instability. Copper(II) fluoride (CuF2) is a well-known compound, but copper(I) fluoride is less common and not readily available as a stable material.