Hyposulfite

Hyposulfite may refer to:
 * The sulfoxylate anion
 * 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 thiosulfurous acid, which is also of doubtful existence.
 * Dithionite as in sodium dithionite.