萨雷马岛(爱沙尼亚语：Saaremaa；芬兰语：Saarenmaa；瑞典语、德语：Ösel；拉丁语：Osilia)，爱沙尼亚第一大岛，面积2673平方公里。萨雷马岛位于波罗的海里加湾西口处，北隔索埃尔海峡与希乌马岛相邻，南隔伊尔别海峡与拉脱维亚相望。全岛属萨雷县管辖，人口4万人，首府库雷萨雷，人口1.6万人。

Saaremaa (Estonian pronunciation: [ˈsɑːremɑː]; Danish: Øsel; English (esp. traditionally): Osel; Finnish: Saarenmaa; Swedish & German: Ösel) is the largest island in Estonia, measuring 2,673 km (1,032 sq mi). The main island of Saare County, it is located in the Baltic Sea, south of Hiiumaa island, and belongs to the West Estonian Archipelago. The capital of the island is Kuressaare, which has about 15,000 inhabitants; the whole island has over 30,966 inhabitants.