Magnetic fields play an important role in the evolution of all stellar objects, through their ability to influence and alter the angular momentum evolution, internal mixing, activity phenomena, surface abundances and mass-loss of stars. This research field benefits from new highly accurate measurements and numerical simulations, enabling stellar astrophysicists to take magnetic fields into account in most models of stellar structure and evolution. We want to bring together researchers from different fields where magnetic fields play an important role to join their efforts and discuss their common interests.