Cosmic Magnetic Fields While magnetic fields permeate the universe on all scales the present book is dedicated to their investigation on the largest scales and affords a balanced account of both theoretical and observational aspects. Written as a set of advanced lectures and tutorial reviews that lead up to the forefront of research this book offers both a modern source of reference for the experienced researchers as well as a high level introductory text for postgraduate students and nonspecialist researchers working in related areas. TOC:Magnetic Fields in the Early Universe. Observations of Magnetic Fields in the Distant Universe. Magnetic Fields in Galaxies. The Origin of Magnetic Fields. Numerical Magnetohydrodynamics in Astrophysics. Importance of Magnetic Helicity in Dynamos. Magnetic Fields in the Milky Way From Radio Continuum and Faraday Rotation Studies. Magnetic Fields in Diffuse HI and Molecular Clouds. Stellar Magnetic Fields. The Origin of the Global Magnetic Structure in the Milky Way