This study was carried out to determine insect pests and their natural enemies in walnut orchards in Van lake basin in 2005-2006. Steiner funnel, visual observation and rearing method were used for samplings. As a result, 29 phytophagous species belonging to 11 different families and 21 beneficial insect species belonging to 6 families were determined. It was observed that Cydia pomonella (L., 1758) (Lepidoptera: Tortricidae) was the economically important pest, and Panaphis juglandis (Goeze, 1778) (Hemiptera: Callaphididae) had remarkable population level. Chrysoperla carnea (Stephens, 1836) (Neuroptera: Chrysopidae) and Adalia fasciatopuncata revelierei (Mulsant, 1866) (Coleoptera: Coccinellidae) were the most common and widely distributed species among natural enemies obtained.