INTODUCTION: - Hypotension is a 20% to 30% reduction in systolic blood pressure,rncomparing it to initial values or absolute systolic blood pressure values between 100 mmHgrnand 90 mmHg. Hypotension during spinal anesthesia for cesarean section is one of the mostrncommon complication which decreases uteroplacental perfusion.rnOBJECTIVES: - To assess incidence and risk factors of post spinal hypotension amongrnpregnant mothers who delivered by elective cesarean sections from January to Februaryrn2016rnat Gandhi Memorial Hospital, Addis Ababa.rnMETHODS: - Institution based cross sectional study design was conducted. All list of pregnantrnmothers who gave birth by elective cesarean section under spinal anesthesia at Gandhi MemorialrnHospital were included. Training was given for data collectors and supervisors. Regularrnsupervision and follow up made. Data was entered in to Epi info version 7 software and transportedrnto SPSS version 20 for analysis. Odd ratio and 95% confidence interval was computed. Bivariaternand Multivariate analysis used to identify factors associated with hypotension.rnRESULTS: - The study was conducted on 60 study participants. 24(40%) were equally foundrnbetween 25-29 years and 30-34 years. The incidence of hypotension was 80% during five to fifteenrnminute and 83% during fifteen to twenty five minute. 70% of the study participants were preloadedrnwith more than 500ml of crystalloid and 60% were took oxytocin for uterine contraction. Majorityrnof them were positioned in supine position prior to spinal anesthesia.rnCONCLUSION AND RECCOMENDATION: -The incidence of hypotension was high so thatrnvigorous fluid resuscitation and the use of prophylactic vasopressor were recommended.rnKeywords: hypotension, pre-loading, spinal anesthesia