The present invention relates to an improved process for preparation of Rotigotine or an acid addition salt thereof. The present invention also relates to process for the preparation of crystalline Rotigotine hydrochloride and crystalline Rotigotine base. The present invention further relates to crystalline (-)-5-hydroxy-W-n-propy/-2-aminotetralin, a key intermediate used in the preparation of Rotigotine.[IN-CHE-2009-00795A]