This volume provides an in-depth review of all aspects of solar magnetic fields. Written by world-leading experts, these thirteen papers cover all regions of the subject from the solar interior, photosphere, chromosphere, active regions, and corona out to the solar wind. The history of solar magnetic fields as well as the necessary instrumentation are also covered. The volume serves as both a reference for researchers and a starting point for graduate students. Originally published in Space Science Reviews, Volume 210, Issue 1-4, September 2017