网页浏览器之争（英语：Browser wars）是指不同的网络浏览器之间为争取用户优先采用，造成彼此市场份额的竞争。通常可分为两段时期的竞争过程：

近几年来，随着HTML5、CSS3等新标准的制定和智能手机、平板电脑的普及，网络浏览器的竞争也在新的领域展开。

A browser war is competition for dominance in the usage share of web browsers. The first browser war was Microsoft's Internet Explorer against Netscape's Navigator during the late 1990s. Browser wars continued with the decline of Internet Explorer's market share since 2003 and the increasing popularity of browsers including Mozilla Firefox, Google Chrome, Safari, and Opera.