Background: Hydatid cysts are one of the serious complications following echinococcus infection. The liver and the lungs are the most affected organs, respectively. The severity of the disease is associated with the increase in the number and the size of the cysts, cysts rupture, and systemic effects. The aim of this study is to evaluate prognostic factors that are associated with the increased incidence of postoperative complications following pulmonary hydatid cyst surgery. Methods: Patients referred to Madani hospital from 2014-2018, presenting pulmonary hydatid cysts were included in this study. All the patients were evaluated based on the following parameters: age, gender, location and size of the cysts, rupture status of the cysts (intact or perforated), type of surgical intervention (capitonnage or segmentectomy) and Erythrocyte Sedimentation Rate (ESR). The factors were then compared with postoperative complications. Statistical analysis of the data obtained was conducted using R-software Results: Of 76 patients enrolled in our study, 52.63% were males and 47.36% were female. Air leak complication was reported in 13.15% of the patients and 3.94% of the patients were presented with pleural effusion. Postoperative complications were significantly associated with the perforated (ruptured) cysts p= 0.001, segmentectomy p= 0.013, giant hydatid cysts p= 0.007 and ESR p= 0.014. However, the side of the lung was not significantly related to postoperative complications. Conclusion: Our study reports that perforated cysts, increased size, segmentectomy and abnormal ESR are likely to increase postoperative complications following pulmonary hydatid cysts surgery. Prospective studies with perioperative parameters and greater sample size can help to deduce better inferences.