Studies on seed insect pests, conducted in the laboratory at the Pakistan Forest Institute, Peshawar revealed that seeds of 30 out of 70 tree species were infested with 24 insect species. Among them 86% Coleopterous and 5.6% Lepidopterous adults represented 23 species of seed pests while 8.4% adults belonged to a Hymenopterous parasite. 13 of the 24 insect species, identified by the I.I.E. London, belonged to Coleoptera (9 species), Lepidoptera (3 species) and Hymenoptera (1 species). Caryedon serratus among Coleoptera and Hypsipyla robusta and Didia sp. Among Lepidoptera were found the most serious pests infesting seeds of Acacia tortilis (80%), Cedrela toona (97.5%) and Bauhinia variegate (73.5%) respectively. The unidentified pests caused heavy infestation of seeds of Acaica catechu (98.4%), Aleurites fordii (88.8%) and Pongamia glabra (62.3%) whereas seeds of 40 tree species were found free from insect damage. A Hymenopterous parasite, Phanerotoma sp. Caused 16% parasitism in each of Coleopterous and Lepidopterous pests.