埃维亚岛（希腊语：Εύβοια），又译优卑亚岛，是仅次于克里特岛的希腊第二大岛，与东北方的斯基罗斯岛（Σκύρος）组成埃维亚州。此形状狭长的岛位于色萨利以东的爱琴海中，呈海马状，约长150公里(93英里)，宽度由50公里(31英里)至6公里(3.7英里)不等。其东南方延伸至一系列岛屿如安德罗斯岛、蒂诺斯岛和米科诺斯岛。隔尤里普斯海峡与希腊大陆相望。该岛面积4167.449平方公里，首府为哈尔基斯（Χαλκίδα）。

根据2001年的人口普查，岛上的居民数量为198,130人，使埃维亚岛成为希腊人口第二多的岛屿。埃维亚岛被认为原本是希腊大陆的一部分，后因一场地震而分开。

Euboea (/juːˈbiːə/; Greek:Εύβοια, Evvia; Ancient Greek: Εὔβοια, Eúboia) is the second-largest Greek island in area and population, after Crete. The narrow Euripus Strait separates it from Boeotia in mainland Greece. In general outline it is a long and narrow, seahorse-shaped island; it is about 180 kilometres (110 mi) long, and varies in breadth from 50 kilometres (31 mi) to 6 kilometres (3.7 mi). Its general direction is from northwest to southeast, and it is traversed throughout its length by a mountain range, which forms part of the chain that bounds Thessaly on the east, and is continued south of Euboea in the lofty islands of Andros, Tinos and Mykonos.