A survey of the methods of preparation and of the chemical properties of thiohydroxamic acids is given. 1. Preparation of Thiohydroxamic Acids 1.1. Reaction of Hydroximic Acid Chlorides or Nitrile Oxides with Sulfur Compounds 1.2. Thioacylation of Hydroxylamines 1.3. Reaction of Nitro Compounds with Thiols 1.4. Addition of Hydroxylamines to lsothiocyanates 1.5. Other Methods of Preparation 2. Properties and Reactions of Thiohydroxamic Acids 2.1. Topology of the Thiohydroxamic Acid System 2.2. Thermal Stability of Thiohydroxamic Acids 2.3. Chemical Reactions of Thiohydroxamic Acids