Rukunin methyl rukuni ne na sinadarai wanda ya ƙunshi carbon atom guda ɗaya wanda aka haɗa da atom ɗin hydrogen guda uku (-CH3). Yawancin lokaci ana amfani dashi azaman naúrar a cikin sinadarai na halitta don bayyana kasancewar wannan rukuni a cikin kwayar halitta. Ƙarin ko cire ƙungiyar methyl na iya rinjayar kaddarorin da sake kunnawa na kwayar halitta.
