亚美利加洲，简称美洲，位于西半球，自然地理分为北美洲和南美洲，面积达4254.9万平方公里，占地球地表面积的8.3%、陆地面积的28.4%。人文地理则将之分为盎格鲁美洲（大多使用英语）和拉丁美洲（大多使用西班牙语和葡萄牙语）。美洲地区拥有大约9.5亿居民，占到了人类总数的13.5%。

最早发现并移民美洲的美洲原住民是东亚黄种人后裔，迁徙时间至晚约在一万年前。对于欧洲人来说，美洲最初并不为所知，后被航海家哥伦布于1492年发现，并误认为是印度，以致称当地人为印第安人流传之今。后以意大利探险家亚美利哥·韦斯普奇的名字命名，并沿用至今。

The Americas, or America, also known as the Western Hemisphere and the New World, comprise the totality of territories in North America and South America.

Along with their associated islands, they cover 8% of the Earth's total surface area and 28.4% of its land area. The topography is dominated by the American Cordillera, a long chain of mountains that run the length of the west coast. The flatter eastern side of the Americas is dominated by large river basins, such as the Amazon, Mississippi, and La Plata. Since the Americas extend 14,000 km (8,700 mi) from north to south, the climate and ecology vary widely, from the arctic tundra of Northern Canada, Greenland, and Alaska, to the tropical rain forests in Central America and South America.