血管再成形术（Angioplasty），又名血管成形术、血管扩张手术，泛指为血管进行扩张的医学手术，通常用以治疗动脉硬化。目前最广泛进行的血管再成形术，为针对心脏冠状动脉的冠状动脉再成形术。

Angioplasty (or Balloon angioplasty) is an endovascular procedure to widen narrowed or obstructed arteries or veins, typically to treat arterial atherosclerosis. An empty, collapsed balloon, known as a balloon catheter, is passed over a wire into the narrowed locations and then inflated to a fixed size. The balloon forces expansion of the stenosis (narrowing) within the vessel and the surrounding muscular wall, opening up the blood vessel for improved flow, and the balloon is then deflated and withdrawn. A stent may or may not be inserted at the time of ballooning to ensure the vessel remains open.