Titanyl sulfate is the inorganic compound with the formula TiOSO<sub>4</sub>. It is a white salt that forms by treatment of titanium dioxide with sulfuric acid, either directly or indirectly. It hydrolyzes to a gel of hydrated titanium dioxide. Characteristic of most titanium(IV) compounds with oxygen-containing ligands, the species also includes oxo ligands.
A number of methods provide titanium(IV) sulfates. One approach begins with , which can be obtained from hydrous titanium(IV) oxides. This salt is treated with hot aqueous sulfuric acid to degrade the oxalate:
The structure consists of dense polymeric network with tetrahedral sulfur and octahedral titanium centers. The six ligands attached to titanium are derived from four different sulfate moieties and a bridging oxide. A monohydrate is also known, being prepared similarly to the anhydrous material. In the hydrate, one Ti–OS bond is replaced by Ti–OH<sub>2</sub>.