Background: Superparasitism refers to the oviposition behavior of parasitoid females who lay their eggs in an already parasitized host. This often yields intense competition among larvae that are sharing the same host. Objectives: the present study aimed to Evaluate the supperparasitism behavior of the larval pupal endoparasitoids O. pallipes as affected by the host population. Methods: Broad bean (Vecia faba), was selected as a host plant. Hundred infested leaves with L. trifolii were taken weekly. Samples were kept in plastic bags and transferred to be examined in the laboratory. To evaluate Superparasitism for the parasitoids O. pallipes, 100 parasitized larvae were collected weekly. Larvae were checked and the number of the parasitoid larvae counted and recorded. Results: out of (1700) parasitized larvae (1224) were described as solitary parasitized and, (476) were described as superparasitised. The total number of the parasitoid individuals recorded (2278) while, the parasitoid host ratio calculated was 1.34: 1. Percentage of solitary parasitism recorded (72%) and, the percentage of superparasitism recorded (28%). On the other hand superparsitised larvae were divided into three groups: the presence of 2 larvae in a single host larva (first type) recorded (385), the presence of 3 larvae in a single host larva (second type) recorded (69), and, the presence of mor than 3 larvae (third type) in a single host larva recorded (22). The highest occurrence of solitary parasitism recorded (88 solitary parasitized larvae) combined with (312 L. trifolii larvae/ 100 infested leaflets) recorded in 11th of February while, the lowest occurrence of solitary parasitism recorded (50 solitary parasitized larvae) combined with (138 L. trifolii larvae / 100 infested leaflets) recorded in 17th of December. The highest occurrence of the first type of superparasitism recorded (33) in 7th of January combined with (144 L. trifolii larvae / 100 infested leaflets) while, the lowest o