Purpose: The aim of the study to evaluate post-operative radiological complications of Coronary Artery Bypass Surgery. Methods: Our retrospective study include 257 patients, aged 45-75 years, of both sexes, with history of post Coronary Artery Bypass graft at Queen Alia Cardiac Center and scanned at King Hussein Hospital/ Radiology department during the 2019 period. Results: 81 patients showed complication after Coronary Artery Bypass Surgery with the graft occlusion and severe stenosis being the most common seen in 47 patients followed by graft calcification (Atherosclerosis) in 22 patients, in the other hand 176 patients showed no radiological complication with 68 patients performed the graft more than 10 years ago. Conclusions: Coronary artery bypass surgery is used to graft blood vessel artery or vein to bypass blockage in the coronary arteries, post-operative radiological complication of CABG include occlusion, calcification thrombosis, spasm and aneurysm formations. Coronary CT angiography is modality of choice to follow up post CABG patients. although the short term outcomes of CABG are generally excellent, patients remain at risk for future cardiac events due to progression of native coronary artery disease and or coronary bypass graft failure.