Windows NT，新技术视窗操作系统（Windows New Technology）的简称，是美国微软公司1993年推出的操作系统核心。

Windows NT是基于OS/2 NT的基础编制的。OS/2是由微软和IBM联合研制，分为微软的Microsoft OS/2 NT与IBM的IBM OS/2。由于双方在协作后来不欢而散，IBM继续向市场提供先前的OS/2版本；而微软则把OS/2 NT改名为Windows NT，并在1988年11月开始了对于“WinNT”（即第一代的Windows NT 3.1）的产品研发。在研发初期，“WinNT”曾一度被认为将会是原先OS/2的3.0版本。

Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It is a processor-independent, multiprocessing, multi-user operating system.

The first version of Windows NT was Windows NT 3.1 and was produced for workstations and server computers. It was intended to complement consumer versions of Windows (including Windows 1.0 through Windows 3.1x) that were based on MS-DOS. Gradually, the Windows NT family was expanded into Microsoft's general-purpose operating system product line for all personal computers, deprecating the Windows 9x family.