Electrocatalytic devices such as fuel cells and redox flow batteries emerged as an appealing platform for renewable energy applications. The application of magnetic field to electrochemical systems, through diverse mechanisms, demonstrated good potential to enhance the efficacy of the energy-relevant electrocatalytic reactions. This talk will discuss some of our results in magnetic field-assisted enhancement in the electrocatalytic activity of molecular and network catalysts. The magnetic field-assisted enhancement in the performance of electrocatalytic devices and its fundamentals unraveled through a combined experimental-theoretical exploration and diverse microscopic and spectroscopic techniques, including electron spin resonance (ESR) spectroscopy, scanning electrochemical microscopy (SECM), and X-ray absorption spectroscopy (XAS), will be presented.