This volume includes 29 articles from the Journal of Geophysical Research Special Issues on Granites and Rhyolites. These provide foundational references for understanding the origin, evolution, and emplacement of granitic and rhyolitic systems, which are fundamental to understanding the formation of Earth's crust. Barker's introductory article gives a wonderful overview of the definition and models for the generation of granitic-rhyolitic magmas prevalent at the time (~1981). The articles by leading researchers range between process-focused research with field-based examples to syntheses of regional geologic and geochemical observations. A global perspective is presented, with examples drawn from rocks from Western United States and Mexico, the St. Francois Mountains of Missouri, the British Caledonide belt, southeastern Australia, Japan, the Himalayas, and Greenland. This Special Issue remains a “must read” for those interested in the petrogenesis of granite-rhyolite systems.