Sulfur trichloride anion is stable in the gas phase. Computational results at the GZ level indicate that SCl3- lies 99.0 kJ/mol below the dissociation products, dichlorosulfide and chloride anion, on a single-well potential energy surface. The anion has a T shape, with axial S-Cl bond lengths of 2.383 Angstrom and an equatorial S-Cl bond length of 2.068 . Collision-induced dissociation results obtained using a flowing afterglow-tandem mass spectrometer give a D-O(SCl2-Cl-) bond energy of 85 +/- 8 kJ/mol.