Background: Now on these days as quality of patient care has being given big concern inrndeveloping countries, which was not yet, it is necessary to conduct a study to know somernprocedural and treatment complication. Post anesthesia shivering is one of these complications,rnwhich has many deleterious effects on the patient outcome. The cause of shivering isrnincompletely understood. So, it is important to know the overall magnitude and majorrncontributing factors for post anesthesia shivering for better health care.rnObjective: To assess the magnitude and associated factors of post anesthesia shivering inrnZewditu Memorial Hospital, Addis Ababa, Ethiopia from February 01 â€“ March 31, 2016.rnMethods: Institutional based cross-sectional study design was conducted from Feb 01- Marrn31, 2016. A systematic random sampling method was employed to select 179 study subjects. Arnpre-tested structured questionnaire was used to collect data. Perioperative tympanic temperaturernwas recorded every 15 minutes interval.rnResults: The overall incidence of post-anesthesia shivering was 29.1%. From this majority ofrnpatients (60.8%) had grade 3 shivering. In multiple logistic regression analysis, being malernpatient (AOR= 3.273, 95% CI: 1.495, 7.165; p=0.003), older age (AOR= 0.123, 95% CI: 0.032,rn0.469; P=0.002) and tympanic temperature less than 360C (AOR= 2.747, 95% CI: 1.248, 6.049;rnp=0.012) were considered associated factors of PAS.rnConclusion and Recommendation: The incidence of shivering was (29.1%); we alsornconclude that prophylaxis for shivering is necessary in those high risk patients. Age of the patientrnwas the variable with the most predictive power by far. If surgery is planned on patients who arernMale, low core body temperature, children and adult age group every precautions and carernshould be considered to make core body temperature in the normal range post operatively. Forrnpain management alternative, it may be better to use opioids which have known protective effectrnfor shivering.