土星拥有62颗已确定轨道的天然卫星，其中52颗已被命名，大部分体积都很小。另外还有几百颗已知的“小卫星”，位于土星环内。有7颗卫星的质量足够大，其重力使其坍缩成近球体形状（因此若它们是直接环绕太阳公转，则会被归为矮行星）。土星不但拥有复杂的环系统，其卫星系统也是太阳系中最多种多样的。特别值得一提的有土卫六，它是太阳系第二大卫星，而且有着类似于地球的大气层、液态碳氢化合物的湖泊、河流和降雨；另有土卫二，它的南极地区底下很可能有液态水存在。

土星卫星之中有23颗为“规则卫星”，它们顺行的轨道和土星赤道平面的倾斜度并不高。当中有7颗大卫星、4颗与较大卫星共有轨道的特洛依卫星和一对共轨卫星。最后，两颗卫星的轨道是在土星环缝中。这些规则卫星都以泰坦巨人族或其他与农神萨图尔努斯相关的神祇之名来命名。

The moons of Saturn are numerous and diverse, ranging from tiny moonlets less than 1 kilometer across to the enormous Titan, which is larger than the planet Mercury. Saturn has 62 moons with confirmed orbits, 53 of which have names and only 13 of which have diameters larger than 50 kilometers. Seven Saturnian moons are large enough to be ellipsoidal in shape, though only two of those, Titan and Rhea, are currently in hydrostatic equilibrium, as well as dense rings with complex orbital motions of their own. Particularly notable among Saturn's moons are Titan, the second-largest moon (after Jupiter's Ganymede) in the Solar System, with a nitrogen-rich Earth-like atmosphere and a landscape including hydrocarbon lakes and dry river networks; and Enceladus, which is seemingly similar in chemical makeup to comets, emits jets of gas and dust and may harbor liquid water under its south pole region.