The presence and severity of calcified coronary plaque negatively impacts angiographic and clinical outcomes following percutaneous coronary intervention (PCI). Severe coronary calcification is associated with suboptimal stent delivery, deployment, apposition and expansion which can lead to in-stent restenosis and/or thrombosis. Severe coronary calcification is associated with incremental hazard for adverse clinical events, including death, during 5-10 years following PCI despite the use of new generation drug- eluting stents. Multiple technologies including high-pressure noncompliant and modified (cutting/scoring) balloons, atheroablative technologies (laser, rotational or orbital atherectomy), and more recently, intravascular lithotripsy have been used to modify calcified plaque and facilitate optimal coronary stent implantation. Intravascular imaging is critically important to determine the extent and distribution (superficial or deep) of coronary calcification and to aid selection and sequence for use of calcium modifying technologies. Unfortunately, large scale randomized comparative trials of calcium modifying technologies are limited and the relative safety and effectiveness of these modalities is poorly defined. Recent mechanistic and clinical data supporting the use of plaque modifying technologies are reviewed to provide insights into their optimal use.