Dithionitronium hexafloroarsenate is the inorganic compound with the formula . It is the hexafluoroarsenate () salt of S=N=S. The cation is of interest as the sulfur analogue of nitronium (). Hexafloroarsenate is a weakly coordinating anion. According to X-ray crystallography, S=N=S is linear with S-N distances of 146 picometers.