Hyposulfite may refer to: The thiosulfate anion () Sodium thiosulfate, a salt containing the thiosulfate anion , a reported sulfur oxyanion. However salts containing and are not well characterized; they would be conjugate bases derived from the parent hyposulfurous acid (), which is also of doubtful existence. Dithionite () as in sodium dithionite. References Sulfur oxyanions