Aldehyde wani nau'in fili ne na kwayoyin halitta mai dauke da rukunin carbonyl (-CHO) a karshen sarkar carbon. Aldehydes yawanci ruwa ne masu canzawa, marasa launi tare da ƙamshi mai ƙamshi. Ana amfani da su sosai wajen kera wasu sinadarai, kaushi, da robobi, da kuma kera magunguna da kamshi. Wasu misalan aldehydes na yau da kullun sun haɗa da formaldehyde, acetaldehyde, da benzaldehyde. Aldehydes kuma yana taka muhimmiyar rawa a yawancin hanyoyin nazarin halittu, kamar metabolism na carbohydrates da lipids.