List of ocean worlds in the Solar System

This is a list of ocean worlds in the Solar System, planets or satellites known or suspected to harbor substantial volumes of liquid water, either as subsurface oceans beneath ice shells or, in the case of Io, a global magma ocean. The existence of such oceans is inferred through a range of methods, including spacecraft measurements of induced magnetic fields, tidal Love numbers, libration amplitudes, surface geology, and isotopic geochemistry.

Source: Wikipedia — List of ocean worlds in the Solar System (CC BY-SA 4.0)