NPA
NPA may refer to:

Organizations and companies
National Parks Association (disambiguation)
National People's Action, a community organizing network in the United States
National Pasta Association, an association for the United States pasta industry
National Pawnbrokers Association, an American-based trade association
National Physicians Alliance, a multi-specialty medical organization in the United States
National Ploughing Association, organises the National Ploughing Championships in Ireland
National Postdoctoral Association, an organization for postdoctoral researchers in the United States
National Prescription Administrators, a former pharmaceutical company in the United States
Natural Philosophy Alliance, a group that believes mainstream physics and cosmology are wrong
Network Printing Alliance, a group of printer manufacturers
Network Professional Association, an advocate for the international network computing professional in the United States
Northern Pacific Airways, a US low-cost airline
Norwegian People's Aid, a non-governmental labour and humanitarian organization in Norway
National Pharmacy Association of the UK

Government and politics
National Pacification Army, Chinese anti-Kuomintang warlord army formed in 1926
National park authority, a term used in the United Kingdom for the legal body in charge of a national park
National Party of Australia, an Australian political party
National People's Army, the armed forces of the former German Democratic Republic (GDR)
Sardar Vallabhbhai Patel National Police Academy, Indian national institute for training of Indian Police Service (IPS) officers
National Police Agency (disambiguation)
National Port Authority, Liberia
National Production Authority, a former agency of the United States government for defense mobilization from 1950 to 1953
National Prosecuting Authority, a governing body of the Republic of South Africa
New Anticapitalist Party (Nouveau Parti Anticapitaliste), a far-left French political party
New People's Army, armed wing of the Communist Party of the Philippines
Nigerian Ports Authority, a government agency that governs and operates the ports of Nigeria
No party affiliation (disambiguation), a voter or politician who is not affiliated with any political party
Non-Party Affiliate, a politician who is not affiliated with any political party
Non-Partisan Association, a civic political party in Vancouver, British Columbia
Note Printing Australia, a subsidiary of the Reserve Bank of Australia
Transnet National Ports Authority of South Africa
NPA Satellite Mapping, a UK remote sensing company
Non-Prosecution Agreement, a way to avoid prosecution

Science and medicine
N-Propyl-L-arginine, a chemical substance
1-N-Naphthylphthalamic acid, an auxin plant hormone transport inhibitor
Nanopascal (nPa), a unit of pressure
Nasopharyngeal airway, a tube that is designed to be inserted into the nasal passageway
Niemann–Pick disease type A, a genetic disorder

Miscellaneous
Naval Air Station Pensacola (airport code), Pensacola, Florida, USA
.NET Persistence API, also known as NPersistence
Non-performing asset, banking term for loans in jeopardy of default, ones that have not paid principal or interest for 90+ days
Northcoast Preparatory and Performing Arts Academy, a high school in Arcata, California, USA
Northland Preparatory Academy, a middle and high school in Flagstaff, Arizona, USA
Numbering Plan Area, a geographic area assigned a three-digit area code in the North American Numbering Plan (NANP)
Neutral Paralympic Athletes; see Neutral Paralympic Athletes at the 2018 Winter Paralympics