Geodesy is a critical component of understanding complex volcanic systems. The quality and quantity of geodetic data, tools, sensors, and methodologies, have been growing exponentially in recent decades. Geodetic monitoring data are now available for hundreds of volcanoes worldwide at multiple spatial and temporal scales, enabling higher resolution modeling of subsurface structure and plumbing systems. Seafloor geodesy has also opened new perspectives for a much larger number of volcanoes that lie below sea level or the submerged portion of island or coastal volcanoes. More complex, rapid and realistic models are possible because of the joint progress made in data and computational techniques that allow researchers to infer active magmatic and tectonic structures at volcanoes. Here we invite presentations on broad applications of geodesy to global volcanoes, but also studies of individual volcanic systems that improve techniques, apply multidisciplinary approaches, or have impacts on volcanic forecasting.