木卫二又称为「欧罗巴」（英语：Europa，IPA: /juˈroʊpə/；希腊语：Ευρώπη），木星的天然卫星之一，由伽利略于1610年发现（不久之后又被西门·马里乌斯（Simon Marius）独立发现），是四颗伽利略卫星中最小的一颗。在已知的67颗木星卫星中，木卫二是直径和质量第四大，公转轨道距离木星第六近的一颗。

木卫二稍微比月亮小，它主要由硅酸盐岩石构成，并具有水-冰地壳，和可能是一个铁-镍核心。它有稀薄的大气层，主要由氧气组成。它的表面有大量裂缝和条纹，而陨石坑比较罕见。它有在太阳系任何已知的固体物体的最光滑表面。

Europa /jʊˈroʊpə/ (Jupiter II), is the sixth-closest moon of Jupiter, and the smallest of its four Galilean satellites, and the sixth-largest moon in the Solar System. Europa was discovered in 1610 by Galileo Galilei and was named after Europa, mother of King Minos of Crete, who became one of Zeus' lovers. In addition to Earth-bound telescope observations, Europa has been examined by a succession of space probe flybys, the first occurring in the early 1970s.