The genus Encarsia Foerster (Hymenoptera: Aphelinidae) contains species which are important biological control agents of whiteflies (Homoptera: Aleyrodidae) and armoured scales (Homoptera: Diaspididae). The taxonomy of the Encarsia species known as parasitoids of aleyrodids and ooccoids in Iran is revised. Diagnostic descriptions are given for all species and each species is fully illustrated. A dichotomous key is provided to allow the determination of species. Synonym names, host records, species group placement, distribution outside Iran and taxonomic figures are given.