Gallic acid wani nau'in acid ne na kwayoyin halitta tare da dabarar sinadarai C6H2 (OH) 3COOH. An kuma san shi da 3,4,5-trihydroxybenzoic acid. Gallic acid yana faruwa a zahiri a cikin tsire-tsire da yawa, gami da gallnuts, ganyen shayi, inabi, da haushin itacen oak. Ana amfani da shi sosai a cikin masana'antar abinci, magunguna, da sinadarai don kaddarorin sa na antioxidant kuma azaman toshe don haɗin mahaɗan daban-daban. Gallic acid yana da ɗanɗano mai tsami kuma yana narkewa cikin ruwa, barasa, da ether.