The United Nationalist Democratic Organization (UNIDO) was the main political multi-party electoral alliance of the traditional political opposition during the turbulent last years of Philippine President Ferdinand Marcos in the mid-1980s.
Organisasi Demokratik Nasionalis Serikat (bahasa Inggris: United Nationalist Democratic Organization, disingkat UNIDO) adalah aliansi elektoral multi-partai politik utama oposisi politik tradisional pada tahun-tahun terakhir kerontokan Presiden Filipina Ferdinand Marcos pada pertengahan 1980an.