National Democratic Union (Greek: Εθνική Δημοκρατική Ένωσις ΕΔΕ) was a Greek political party. The party was founded in 1974 by Petros Garoufallias a former member of the Centre Union. The party was founded in order to represent the royalists. It participated in the Greek legislative election 1974 and gained 1.08%. After the electoral failure the party dissolved.