Abstract: Chalcidoidea comprises the world`s most important biological control agents. They are parasitoids of many agricultural pests. Some are keystone species and their removal causes cascade effect. Chalcidoidea belong to a Superfamily coming under the order Hymenoptera. It comprises of about 22,000 described species in the world. The study was conducted to find the diversity and distribution of parasitoid wasps of Chalcidoidea (Hymenoptera) in paddy fields of Palakkad district, the granary of Kerala which has large areas under Paddy cultivation. 33 species were collected from the rice ecosystems of the district. About eleven families have been reported from the district. The most dominant genus was found to be Eurytoma. The distribution maps and graphs have been provided in this investigation.