NUP is an abbreviation for: National Umma Party Sudan. a political party in Sudan National Union Party (disambiguation), a number political parties in various states National Unity Party (Philippines) National Unity Platform, main opposition party in Uganda Neapolis University, Pafos, a university in Cyprus Necrotizing ulcerative periodontitis, a subclassification of Necrotizing periodontal diseases New Union Party, a political party in the United States New Unity Partnership, a trade union in the United States Northwestern University Press Nottingham University Press Nuclear Pore Número único previsional ("unique social security number"), the identification number for social security in El Salvador