潘洛斯三角（Penrose triangle）是不可能的物体中的一种。最早是由瑞典艺术家Oscar Reutersvärd在1934年制作。英国数学家罗杰·潘洛斯及其父亲也设计及推广此图案，并在1958年2月份的《英国心理学月刊》（British Journal of Psychology）中发表，称之为「最纯粹形式的不可能」。

潘洛斯三角看起来像是一个固体，由三个截面为正方形的长方体所构成，三个长方体组合成为一个三角形，但两长方体之间的夹角似乎又是直角。上述的性质无法在任何一个正常三维空间的物体上实现。这种对象只能存在于一些特定的欧氏三维流形中。

The Penrose triangle, also known as the Penrose tribar, or the impossible tribar, is an impossible object. It was first created by the Swedish artist Oscar Reutersvärd in 1934. The psychologist Lionel Penrose and his mathematician son Roger Penrose independently devised and popularised it in the 1950s, describing it as "impossibility in its purest form". It is featured prominently in the works of artist M. C. Escher, whose earlier depictions of impossible objects partly inspired it.