NSP is a three-letter abbreviation with multiple meanings, including:
- Afghan National Solidarity Programme
- Nankoku Shōnen Papuwa-kun, a Super Famicom game
- National Ski Patrol
- Netaji Subhash Place (Delhi Metro)
- National Solidarity Party, a political party in Singapore
- Northumbrian smallpipes, a type of highly-evolved bagpipes played in Northern England
- Native Signal Processing, Intel's term for Host Signal Processing
- Nature's Sunshine Products
- Needle and syringe programme
- Network security policy
- Network Service Provider
- Nevada State Prison
- Network of Spiritual Progressives
- New Science Projects
- New Sarum Police, a defunct city police force in Wiltshire, England operational between 1836 - 1838.
- Newsgroup Service Provider
- Night Star Pictures
- None Shall Pass
- Non-starch polysaccharide
- Nuestra Señora de la Paz
- Northern State Parkway
- Northern States Power Company, a division of Xcel Energy
- North Saint Paul
- No Such Person, a United States Postal Service designation
- Nova Scotia Power
- North Staffordshire Polytechnic now Staffordshire University
- Nurse scheduling problem
- Natural swimming pool