The Juno and Cassini missions investigated Jupiter and Saturn, respectively. Juno is on-going and continues to obtain data from its polar orbit with the goal of understanding Jupiter's origin and evolution by investigating the interior, atmosphere and magnetosphere. As the largest and most massive planets in our solar system, Jupiter and Saturn offer unique insight in the history of our solar system and how planetary systems in general form and evolve. Juno has provided new observations of the global atmospheric structure and composition, storm and lightning distribution and cloud morphology and dynamics. Our view and understanding of Jupiter’s and Saturn’s auroras and magnetosphere are ever-changing as we explore these regions in situ with coordinated efforts from Earth-based observatories such as Hubble, Hisaki, Keck, etc. Constraining the present-day interior structure and dynamics of giant planets is critical to understanding the formation and evolution of planets in our Solar System and beyond. Both the Juno and Cassini have provided a wealth of new measurements, revealing key aspects of the interiors of Jupiter and Saturn for the first time. This session will bring together both observations and theoretical interpretations to improve our understanding of giant planets interiors, atmospheres and magnetospheres. We welcome submissions on wide range of topics, including: gravity science; strong differential rotation (zonal flows); properties of intrinsic (dynamo) magnetic fields; the existence and properties of the central core; bulk composition (including helium and heavy element abundance); as well as formation scenarios and evolutionary pathways. This session includes results from atmospheric and magnetospheric observations (Juno, Cassini and Earth-based) as well as theoretical modeling of atmospheric structure, composition, dynamics, planetary aurorae, magnetospheric dynamics and processes and comparative planetology.