The topic of sulphur radicals is vast, due to the propensity of the sulphur atom to exhibit different states of oxidation and co-ordination. This area is extremely important to organic synthetic chemists and environmentalists. S-centered radicals are of increasing interest in biochemistry and medicine, owing to S-containing amino-acids and S-S bonds in proteins. Sulphur radicals are also playing important roles in polymer chemistry and photonic materials, as well as in radiation protection and nutrition.