花窗玻璃（英语：stained glass），为西方建筑装饰品，常见于教堂，设备于建物墙面上。在伊斯兰教的清真寺，花窗玻璃艺术也很常见。其作用原理是，当日光照射玻璃时，可以造成灿烂夺目的效果。而在电灯时代，夜间从教会内放射出的彩光，更是气象万千。早期花窗玻璃多以圣经故事为内容，以光线配合图案的效果感动信徒。而一些教会所在地本地的传说和神话，也会进入其主题之中。近代以来，花窗玻璃不仅出现在教堂，也在许多一般建筑中获得应用。

Leadlights or leaded lights are decorative windows made of small sections of glass supported in lead cames. The technique of creating windows using glass and lead came is discussed at came glasswork. The term leadlight could be used to describe all windows in which the glass is supported by lead, but traditionally, a distinction is made between stained glass windows and leadlights, the former being associated with the ornate windows of churches and other such works of architecture and the latter with the windows of vernacular commercial and domestic architecture and defined by its simplicity.