在有机化学中，芳基指任何从简单芳香环衍生出的官能团或取代基。虽然更特殊的名称如苯基，被用来描述未被取代的芳基，但出于概括和简练的原因芳基仍然被使用。

最简单的芳基是苯基（Phenyl），由苯衍生而来。

In the context of organic molecules, aryl is any functional group or substituent derived from an aromatic ring, usually an aromatic hydrocarbon, be it phenyl, naphthyl, thienyl, indolyl, etc. (see IUPAC nomenclature). "Aryl" is used for the sake of abbreviation or generalization, and "Ar" is used as a placeholder for the aryl group in chemical structure diagrams.