NT or nt may refer to:
NTFS (New Technology File System) is a proprietary file system developed by Microsoft. Starting with Windows NT 3.1, it is the default file system of Windows NT family.
NTSC, named after the National Television System Committee, is the analog television system that is used in the Philippines, and until digital conversion was used in most of the Americas (except Brazil, Argentina, Paraguay, Uruguay, and French Guiana); Burma; South Korea; Taiwan; Japan; and some Pacific island nations and territories (see map).
NTPC Ltd., formerly known as National Thermal Power Corporation Limited, is an Indian Public Sector Undertaking, engaged in the business of generation of electricity and allied activities.
NTN Corporation (NTN株式会社, NTN Kabushiki-gaisha) (a.k.a. Niwa, Tomoe, Nishizono) is one of the most prominent manufacturers of bearings in Japan, second domestically only to NSK Limited.
NTT DOCOMO, Inc. (株式会社NTTドコモ, Kabushiki Gaisha Enu Ti Ti Dokomo) is the predominant mobile phone operator in Japan.
NTL Incorporated, branded as ntl:, was a U.S.-listed British company founded in 1992, which provided cable television, cable internet and fixed-line cable telephone services.
In a Windows network, NT LAN Manager (NTLM) is a suite of Microsoft security protocols that provides authentication, integrity, and confidentiality to users.
NTS Motorsports was an American professional stock car racing team that competed in the NASCAR Camping World Truck Series.