The “Theory and Simulation of Solar System Plasmas” session solicits presentations of the latest results from theoretical investigations and numerical simulations in space plasma-physics from microscopic to global scales, in comparison with experiments and observations in the heliosphere: at the Sun, in the solar corona, in interplanetary space and in planetary magnetospheres. Each year a topic of special interest is chosen as a focus of the session. For 2018 this focus will be on particle acceleration and plasma heating. Of particular interest is the role of suprathermal populations in dynamical processes in the heliosphere, such as shocks, magnetic reconnection, instabilities and dissipation. There are challenging questions in fundamental plasma physics which require the integration of kinetic plasma physics with fluid models. We encourage presentations on theory and modelling which are directly relevant to current, forthcoming and proposed space missions, notably MMS, Parker Solar Probe, Solar Orbiter and THOR.