克拉通或称稳定地块、大陆核心、古陆、古陆核、刚块、安定地块（来自希腊语kratos，意为“强度”）是大陆地壳上的古老而稳定的部分，在最近至少5亿年内的大陆和超大陆的会聚和分裂过程中几乎没有发生变化。有些克拉通甚至在20亿年前或更早就形成了。克拉通一般都存在于大陆内部，由古代的结晶基底构成，这些基岩的成分主要是小比重的长英质火成岩如花岗岩。克拉通内的地壳较厚，并有深根插入地幔，可达200公里深处。

克拉通一词最早是由德国地质学家L. Kober在1921年提出的。他把坚固的大陆地台叫做"Kratogen"，而把与之相对的山地或曾经形成过山脉的地区叫做"orogen"。后一术语原封不动地沿用下来，中文译为造山带。前一术语则被后来的学者简化成kraton或craton。

A craton (pronunciation: /ˈkreɪtɒn/, /ˈkrætɒn/, or /ˈkreɪtən/; from Greek:κράτος kratos "strength") is an old and stable part of the continental lithosphere. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates. They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into the Earth's mantle.