Mitri, G.G.MitriBarnes, J.J.BarnesCoustenis, A.A.CoustenisFlamini, EnricoEnricoFlaminiHayes, A.A.HayesLorenz, R.D.R.D.LorenzMastrogiuseppe, M.M.MastrogiuseppeOrosei, R.R.OroseiPostberg, F.F.PostbergReh, K.K.RehSoderblom, J.M.J.M.SoderblomSotin, C.C.SotinTobie, G.G.TobieTortora, P.P.TortoraVuitton, V.V.VuittonWurz, P.P.Wurz2024-06-112024-06-112021-07-22https://hdl.handle.net/20.500.13025/6498We present a White Paper with a science theme concept of ocean world evolution and habitability proposed in response to ESA’s Voyage 2050 Call with a focus on Titan and Enceladus in the Saturn system. Ocean worlds in the outer Solar System that possess subsurface liquid water oceans are considered to be prime targets for extra-terrestrial life and offer windows into Solar System evolution and habitability. The Cassini-Huygens mission to the Saturn system (2004–2017) revealed Titan with its organic-rich evolving world with terrestrial features and Enceladus with its active aqueous environment to be ideal candidates to investigate ocean world evolution and habitability. Additionally, this White Paper presents a baseline for a multiple flyby mission with a focused payload as an example of how ocean world evolution and habitability in the Saturn system could be investigated building on the heritage of the Cassini-Huygens mission and complementing the recently selected NASA Dragonfly mission. © 2021, The Author(s).enjournal article10.1007/s10686-021-09772-2https://link.springer.com/article/10.1007/s10686-021-09772-2