Un arco iris lunar (también conocido como arco iris blanco o sencillamente arco lunar) es un arco iris que ocurre por la refracción de la luz, en este caso lunar, sobre una lluvia o neblina nocturna. Los arcos iris lunares son relativamente tenues, debido a la escasa cantidad de luz que llega desde la Luna. Como los arcos iris, los arcos lunares se encuentran siempre en el lado opuesto del cielo desde el que llega la luz de la luna.

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A moonbow (also known as a lunar rainbow or white rainbow), is a rainbow produced by moonlight rather than sunlight. Other than the difference in light source, its formation is exactly the same as for a solar rainbow: It is caused by the refraction of light in many water droplets, such as a rain shower or a waterfall, and is always positioned in the opposite part of the sky from the moon relative to the observer. Moonbows are much fainter than solar rainbows, due to the smaller amount of light reflected from the surface of the moon. Because the light is usually too faint to excite the cone color receptors in human eyes, it is difficult for the human eye to discern colors in a moonbow. As a result, a moonbow often appears to be white. However, the colors in a moonbow do appear in long exposure photographs. Moonbows have been mentioned at least since Aristotle's Meteorology (circa 350 BC), and also in an 1847 publication.

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