This third of three volumes includes papers from the second series of NODYCON, which was held virtually in February of 2021. The conference papers reflect a broad coverage of topics in nonlinear dynamics, ranging from traditional topics from established streams of research to those from relatively unexplored and emerging venues of research. These include

· Complex dynamics of COVID-19: modeling, prediction and control

· Nonlinear phenomena in bio-systems and eco-systems

· Energy harvesting

· MEMS/NEMS

· Multifunctional structures, materials and metamaterials

· Nonlinear waves

· Chaotic systems, stochasticity, and uncertainty