The generation of electromagnetic waves, their propagation in inhomogeneous plasmas, amplification and absorption by - and interactions with - charged particle populations (generally covered by the term “wave-particle interactions”), are key processes responsible for energy and momentum exchange between charged particles in absence of collisions. A new generation of spacecraft missions (PSP, Solar Orbiter, MAVEN, Juno, MMS, ERG/Arase) provide unique and detailed information about wave-particle interactions and their impact on microscopic plasma kinetics as well as the contribution to dynamics of macroscopic plasma systems. Observations of these missions show similarities and differences of wave-particle interactions in solar wind, radiation belts, and magnetospheres of different planets - driving rapid growth of new theoretical concepts, including effects of nonlinear and nonresonant interactions into more conventional quasi-linear models. This session aims to connect specialists focused on spacecraft observations of different aspects of wave-particle interactions in various space plasma systems, and specialists working on the next generation of theoretical and computational models incorporating nonlinear and nonresonant interaction effects.