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This session aims to advance our understanding of various plasma processes occurring in the heliosphere and interplanetary space. The scope includes the solar corona, solar flares, coronal mass ejections (CMEs), the solar wind, and energetic particles, as well as their impacts on the environments of the Earth, planets, and the Moon. It also covers global structures of the heliosphere associated with solar activity, variations in cosmic-ray intensity, and the outer heliosphere. Fundamental physical processes such as shocks, waves, turbulence, particle transport, and acceleration are also key topics of discussion. We welcome studies employing diverse approaches, including observations, data analysis, theory, modeling, numerical simulations, and instrument development. These research subjects lie at the intersection of multiple fields, such as solar physics, space physics, and cosmic-ray research, and understanding their interconnections provides the physical basis for space weather and space climate studies. While focusing on fundamental plasma physics in the heliosphere and interplanetary space, this session also discusses applications in predictive modeling and technological development through observations, simulations, data assimilation, and AI-based approaches, aiming to foster interdisciplinary collaboration and share future perspectives in heliospheric research.