The present invention provides methods and compositions for treating or preventing atherosclerosis in a subject. The methods of the present invention comprise administering an inhibitor of angiopoietin-like protein-3 (ANGPTL3) to a subject who has atherosclerosis or is at risk of developing atherosclerosis. In certain embodiments, the ANGPTL3 inhibitor is an antibody or antigen-binding fragment thereof that specifically binds ANGPTL3.