月球瞬变现象（TLP）是月球表面亮度、色泽或外观上的短暂变化。

有关月球瞬变现象的说法至少可追溯到1000年前，一些目击者或有声望的科学家曾独立地观察到这一现象。但大多数报道的月球瞬变现象都无法再现，不具备足以用来作区分假说或解释起源的对照实验。

大多数月球科学家都承认瞬态事件，如月球地质史中所发生的释气和撞击坑，但问题的焦点是：此类事件发生的频率。

1968年帕特里克·穆尔在他参与合编的美国宇航局 R-277 技术报告-《月球事件报导年鉴》中，创建了“月球瞬变现象”这一术语。

A transient lunar phenomenon (TLP) or lunar transient phenomenon (LTP) is a short-lived light, color, or change in appearance on the surface of the Moon.

Claims of short-lived lunar phenomena go back at least 1,000 years, with some having been observed independently by multiple witnesses or reputable scientists. Nevertheless, the majority of transient lunar phenomenon reports are irreproducible and do not possess adequate control experiments that could be used to distinguish among alternative hypotheses to explain their origins.