Ƙungiyar etanoyl, wanda kuma aka sani da ƙungiyar acetyl, ƙungiya ce mai aiki da ta ƙunshi ƙungiyar carbonyl (C = O) da aka haɗa zuwa ƙungiyar methyl (-CH3). Tsarin sinadaran sa shine -COCH3, kuma yawanci ana wakilta shi azaman Ac ko AcO a cikin sinadarai na halitta. Ana samunsa sau da yawa a cikin ƙwayoyin halitta kamar acetic acid, acetylcholine, da acetylsalicylic acid (aspirin).
