In a study conducted in the Fars province of Iran, totally four species of flat wasps (Family Bethylidae) record from Iran for the first time. Collected specimens were deposited in ethyl alcohol 96%. Specimens Identified by Mr. Jeroen De Rond, expert in flat wasps (Bethylidae) identification and scientific illustration from The Netherlands. Two species of this records Bethylus boops (Thomson,1862) and Bethylus mandibularis (Kieffer, 1904) where collected on mulberry (Morus sp.) branches from Badjgah college of agriculture, university of Shiraz, Holepyris glabratus (Fabricius, 1798) were collected from flour moth larvae Ephestia kuehniella container in insectarium and Laelius pedatus (Say, 1836) were collected in house carpet in Shiraz and seems that related to carpet beetles (Coleoptera, Dermestidae) anthrenus sp. Bethylus boops is associated with ant colonies, Bethylus mandibularis specimen is slightly differ in the sculpture of the propodeum and position of the ocellar triangle from European specimens, but other characters are matched with type species. Holepyris glabratus was described as Tiphia glabrata. Epyris hawaiiensis was synonymised with this species. Laelius pedatus is an American species, mostly found in indoor and museums. In outdoor species of this genus appear to be related to Dermestidae hosts in old birds’ nests.