Hypervalent iodine(III) reagents have profound applications in a range of facile and novel synthetic methodologies primarily due to their remarkable oxidizing property, robust synthetic utility, environmentally benign nature and easy availability. This chapter emphasises mainly on the various transition metal-free reactions of hypervalent iodine(III) reagents for the construction of a diverse range of heterocyclic compounds. © 2020, Societa Chimica Italiana.