Magnetic field effects on electrochemical depositions are classified into the magnetohydrodynamic (MHD) convection effect on electrodepositions, the micro-MHD effect (the Lorentz force acting on the diffusive motion of ions) on electroless depositions, and the effect of diamagnetic orientation on electropolymerizations. These effects on fractal growth morphology are reviewed from viewpoints of morphology tailoring and pattern formation science.