Computing
* Neighbor Discovery Protocol, an Internet protocol * Nortel Discovery Protocol, a layer two Internet protocol, also called SONMP * Nondeterministic programming, a type of computer languageGovernment
* National Development Plan, in Ireland * National Development Policy, in Malaysia * Norwegian Petroleum Directorate, agency responsible for the regulation of Norwegian oil resourcesPolitical parties
* Nagaland Democratic Party, India (1999–2004) * National Defence Party (disambiguation), any of several parties * National Democratic and Labour Party, United Kingdom (1918–1923) * National Democratic Movement (Bosnia and Herzegovina) * National Democratic Party (disambiguation), any of several parties * Nebraska Democratic Party, U.S. * New Democratic Party (disambiguation), any of several parties * Newfoundland Democratic Party (1959) * Nuclear Disarmament Party, Australia (1984–2009) * National Development Party (Brunei)Other disambiguations
* National Democrats (disambiguation) * Democratic National Party (disambiguation)Other
* National Day of Prayer, an annual US observance on the first Thursday of May * NDP (gene), Norrie disease protein * Neodymium phosphide, a compound with the chemical formula NdP * Net domestic product, an economic quantity * New Douglas Park, a football stadium which is the home of Scottish Premiership side Hamilton Academical F.C. * Northumberland Development Project, a proposed football stadium and commercial development in Tottenham, London * Northern Dutchess Paramedics, an advanced life support ambulance service in the Hudson Valley of New York * Notre-Dame de Paris * Singapore National Day Parade * Neutron depth profiling, an analytical technique for measuring isotopic mass in near surface of samples {{disambiguation