Propanoic acid, wanda kuma aka sani da propionic acid, ruwa ne mara launi, mai mai tare da ƙamshi. Wani nau'in acid carboxylic ne tare da dabarar sinadarai CH3CH2COOH. Ana amfani da Propanoic acid a matsayin mai kiyaye abinci kuma a matsayin mafari ga wasu sinadarai, irin su acetate cellulose da propionate. Hakanan ana iya samunsa ta dabi'a a cikin wasu nau'ikan cuku, a matsayin abin da ke haifar da fermentation na ƙwayoyin cuta.