Rate constants and product branching ratios were measured for eleven sulfur oxide, sulfur fluoride, and sulfur oxyfluoride anions reacting with O-3. The SO2- ion reacts rapidly to form -O-3(-) SO3-, and e(-). The temperature dependence of the branching ratio shows more reactive detachment and less SO3- formation at higher temperature. SO3- reacts with O-3, forming SO4- at 1/3 to 1/4 of the collisional rate from 200 to 500 K, respectively. At 300 K, SF6-, charge transfers to O-3 at 20% of the collisional rate, F2SO2- reacts with O-3 at a few percent of the collision rate, forming both O-3(-) and FSO3-; The ion F3SO- reacts slowly with O-3 to form F3SO2-. The ions SO4-, SF5-, FSO2-, FSO3-, F3SO-, and F5SO- are unreactive with O-3. A trend is noted relating the ion reactivity with the coordination of the central sulfur atom, i.e., the number of S-F bonds plus two times the number of S=O bonds. Only ions with a sulfur coordination of 4 or 6 are reactive, although the reaction rate constants are generally small, The reactivity trends appear to be partially explained by spin conservation, These reactions are all sufficiently slow, so O-3 reactions should not play a major role in SF6/O-2 discharges, All ions studied have been found to be unreactive with O-2.