Thiophosphoryl bromide is an inorganic compound with the formula PSBr3.

[4] Thiophosphoryl bromide is one product of the bromination of P4S7 in cold carbon disulfide:[1] Thiophosphoryl bromide has tetrahedral molecular geometry and C3v molecular symmetry.

[5] Thiophosphoryl bromide is soluble in carbon disulfide, chloroform and diethyl ether.

[4] Like other phosphoryl and thiophosphoryl halides,[1] thiophosphoryl bromide readily hydrolyses, undergoes nucleophilic substitution and forms adducts with Lewis acids.

[7] Thiophosphoryl bromide is of use in organic synthesis for reducing sulfoxides to thioethers,[8] and sulfines to thioketones.