荧光素（Luciferin，拉丁文：lucifer）是一类在有机电致发光生物颜料中发现的能够发光的有机物。

• 萤火虫萤光素(Firefly luciferin)

Luciferin (from the Latin lucifer, "light-bringer") is a generic term for the light-emitting compound found in organisms that generate bioluminescence. Luciferins typically undergo an enzyme-catalysed oxidation and the resulting excited state intermediate emits light upon decaying to its ground state. This may refer to molecules that are substrates for both luciferases and photoproteins.