Iodosyl trifluoride is an inorganic compound of iodine, fluorine, and oxygen with the chemical formula .
Synthesis of iodosyl trifluoride can be done by a reaction of iodine pentoxide with iodine pentafluoride.
Synthesis can be by a reaction of gases:
Or alternately by reaction of iodine pentafluoride with water:
Iodosyl trifluoride forms hygroscopic colorless needles. Reacts with water.
Iodosyl trifluoride is hygroscopic and decomposes into and at .