Rhenium trioxide fluoride is an inorganic compound with the formula ReO3F.

It is a white, sublimable, diamagnetic solid, although impure samples appear colored.

The material has no applications, but it is of some academic interest as a rare example of a trioxide fluoride.

Rhenium trioxide fluoride can be prepared by fluorination of rhenium trioxide:[1] With Lewis bases (L) the compound forms adducts with the formula ReO3FL2, e.g., L = diethyl ether and acetonitrile.

[1] According to X-ray crystallography, the compound adopts a helical chain structure featuring octahedral Re centers linked by two fluoride and two oxide bridging ligands.