The genus Dioctria Meigen, 1803 (Diptera: Asilidae, Dioctriinae) was sampled in northern Iran. The specimens were collected using Malaise traps during 2010–2012. A new species Dioctria faciata Mohammadi, Talebi & Van den Broek sp. nov., is described and illustrated. Dioctria tauricaLehr, 2001 is recorded for the Iranian fauna for the first time. The new species can be distinguished from Dioctria cornutaLehr, 2001 by the following characters: black mystax; face slightly swollen at edge of mouth and larger body (8-9 mm vs 5.8 mm). The number of Dioctria species in Iran is now increased to 17. An updated checklist of Iranian species of the genus Dioctria is provided.