冰糖，食用糖类一种，是一种经过提纯的蔗糖。外观晶莹洁白或呈淡黄色，味甘，可入药。

冰糖按制作工艺来分分为两种：单晶冰糖和多晶冰糖。前者**在日治时期即有生产，中国则于1960年代由日本引进该种制糖工艺，特点是口味纯正、甜度适中，在日治时期是**重要的出口商品之一。多晶冰糖采用传统工艺制成。两者最大的区别是养晶方式。

冰糖的制作可分为三个阶段：

• 配料阶段
• 加热阶段
• 养晶阶段

"Rock sugar" redirects to here

Rock candy (also called rock sugar) is a type of confectionery mineral composed of relatively large sugar crystals. This candy is formed by allowing a supersaturated solution of sugar and water to crystallize onto a surface suitable for crystal nucleation, such as a string, stick, or plain granulated sugar. Heating the water before adding the sugar allows more sugar to dissolve thus producing larger crystals. Crystals form after 6–7 days. Food coloring may be added to the mixture to produce colored candy.