欧美大陆（Euramerica）又名劳伦西亚大陆（Laurussia）、老红砂岩大陆（Old Red Continent ）是个史前大陆，形成于泥盆纪时期，由劳伦大陆与波罗地大陆碰撞、合并而成（造成加里东造山运动）。

在二叠纪，包含欧美大陆在内的各大陆，形成一个超大陆－盘古大陆。在侏㑩纪时期，盘古大陆分裂为南北两个部份，劳亚大陆与冈瓦那大陆。在白垩纪，劳亚大陆分裂为北美洲与欧亚大陆。原本的劳伦西亚大陆成为现在北美洲的主体，而波罗地大陆则是欧亚大陆的一部分。

Euramerica (also known as Laurussia (not to be confused with Laurasia), the Old Red Continent or the Old Red Sandstone Continent) was a minor supercontinent created in the Devonian as the result of a collision between the Laurentian, Baltica, and Avalonia cratons (Caledonian orogeny). 300 million years ago in the Late Carboniferous tropical rainforests lay over the equator of Euramerica. A major, abrupt change in vegetation occurred when the climate aridified. The forest fragmented and the lycopsids which dominated these wetlands thinned out, being replaced by opportunistic ferns. There was also a great loss of amphibian diversity and simultaneously the drier climate spurred the diversification of reptiles.