Abstract Water-distilled volatiles of marjoram (Origanum majorana L.) grown in Cuba were analyzed by GC/MS. Among the 41 compounds identified, terpinen-4-ol (17.67%), linalool (16.41%) and thymol (11.55%) were the major constituents. Key Word Index: Origanum majorana Labiataemarjoramessential oil compositionterpinen-4-ollinaloolthymol