彭罗斯阶梯（英语：Penrose stairs）是一个有名的几何学悖论，指的是一个始终向上或向下但却无限循环的阶梯，可以被视为彭罗斯三角形的一个变体，在此阶梯上永远无法找到最高的一点或者最低的一点。彭罗斯阶梯由英国数学家罗杰·彭罗斯及其父亲遗传学家列昂尼德·彭罗斯与1958年提出。

彭罗斯阶梯不可能在三维空间内存在，但只要放入更高阶的空间彭罗斯阶梯就可以很容易的实现。如同莫比乌斯圈于二维空间里是一个不可能物体，但是在三维空间中就很容易实现。与之类似的还有克莱因瓶。

The Penrose stairs or Penrose steps, also dubbed the impossible staircase, is an impossible object created by Lionel Penrose and his son Roger Penrose. A variation on the Penrose triangle, it is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher. This is clearly impossible in three dimensions.