地盾（英语：shield，又称盾地）是大陆地壳上相对稳定的区域，前寒武纪基岩（火成岩或高度变质岩）广泛出露于地面的一类克拉通。地盾长期处于相对隆起的状态，因此受到风化剥蚀很严重，表面的沉积盖层已经缺失或只遗留很薄的一层，褶皱基底广泛地出露地表。地盾的轮廓状如盾形，表面地势没有大的起伏。造山活动、断层、其它地质活动都很少。

地盾通常是大陆板块的核心，环绕着寒武纪岩石褶皱。

全球的著名地盾有：

A shield is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas. In all cases, the age of these rocks is greater than 570 million years and sometimes dates back 2 to 3.5 billion years. They have been little affected by tectonic events following the end of the Precambrian, and are relatively flat regions where mountain building, faulting, and other tectonic processes are greatly diminished compared with the activity that occurs at the margins of the shields and the boundaries between tectonic plates.