NTA is a three-letter abbreviation which can mean several things:
- Net Tangible Assets Calculated as the total assets of a company, minus any intangible assets such as goodwill, patents and trademarks, less all liabilities and the par value of preferred stock. Also known as "net asset value" or "book value".
- Nanoparticle Tracking Analysis individual tracking of nanoparticle brownian motion in liquids
- National Training Awards
- Neutestamentliche Abhandlungen, erscheint in Münster
- National Teachers Association in Nepal
- National Telefilm Associates (Republic Pictures)
- National Television Awards shown in the UK on ITV
- National Transport Authority of Ireland
- National Translator Association. Operators of secondary TV and FM stations in the United States that rebroadcast other TV or FM stations. http://www.tvfmtranslators.com/
- National Treatment Agency for Substance Misuse in England
- National Type Approval, term used by European vehicle manufacturers for the process of satisfying officialdom that a vehicle Type meets the various national legislative requirements, as an alternative to Whole Vehicle Type Approval
- Natural Science and Technical Academy Isny
- Station code for Newton Abbot railway station
- Nigerian Television Authority
- Nitrilotriacetic acid, a chemical compound
- Note To Attend
- NTA Inc Engineering firm and structural testing laboratory
- Nuclei Territoriali Antimperialisti (Anti-Imperialist Territorial Nuclei)
- Northern Techno Alliance - defunct free party crew from Yorkshire
- Non-Teaching Assistant - an assistant in schools in the United Kingdom, now more commonly known as a Teaching assistant (United Kingdom)
- National Tax Agency of Japan
- Newark Teachers Association, a California Teachers Association affiliated trade union
- NTA Film Network
- Newtek Automotive, North American based automotive parts distributor