电子纸（Electronic Paper），简称ePaper。是一种显示器技术，重点在于模仿以在纸上印刷、书写的视觉观感，而耗电量极小。不同于一般的平板显示器以发光达成显示功能，电子纸如同普通纸一样，依靠环境光照亮，所以理论上阅读起来较舒适，而且其显示的影像能在阳光直照下仍然清晰可见，可视角极广理论上为180度，其对比度比其他显示技术高不少，大至而报章印刷效果相同，甚至更好。

大部份电子纸在没有电源情况下能显示原先图片和文本。部份设计以塑料背版和有机电子零件构成柔性电子纸，首款面向欧洲市场的柔性电子纸预计将于2012年4月上市。

Electronic paper and e-paper are display devices that mimic the appearance of ordinary ink on paper. Unlike conventional backlit flat panel displays that emit light, electronic paper displays reflect light like paper. This may make them more comfortable to read, and provide a wider viewing angle than most light-emitting displays. The contrast ratio in electronic displays available as of 2008 approaches newspaper, and newly developed displays are slightly better. An ideal e-paper display can be read in direct sunlight without the image appearing to fade.