Internet Explorer（旧称Microsoft Internet Explorer和Windows Internet Explorer，简称IE或MSIE），是微软所开发的一系列图形用户接口网页浏览器。自从1995年开始，内置在各个新版本的Windows作业系统作为缺省浏览器，也是微软Windows操作系统的一个组成部分。

Internet Explorer伴随着Windows操作系统的高普及率，它曾是使用最广泛的网页浏览器——2003年时市占率约95%。随着Mozilla Firefox（2004年）和Google Chrome（2008年）的推出，它的市占率逐渐下滑。而根据2015年9月的统计数据显示，Internet Explorer各版本累计的市场占有率为15.71％，位居全球第三大网页浏览器。

Internet Explorer (formerly Microsoft Internet Explorer and Windows Internet Explorer, commonly abbreviated IE or MSIE) is a series of graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems, starting in 1995. It was first released as part of the add-on package Plus! for Windows 95 that year. Later versions were available as free downloads, or in service packs, and included in the Original Equipment Manufacturer (OEM) service releases of Windows 95 and later versions of Windows.