电镀(英文:Electroplating)是利用电解的原理将导电体铺上一层金属的方法。

除了导电体以外，电镀亦可用于经过特殊处理的塑胶上。

电镀的过程基本如下：

电镀后被电镀对象的美观性和电流密度大小有关系，在可操作电流密度范围内，电流密度越小，被电镀的对象便会越美观；反之则会出现一些不平整的形状。电流密度指一定面积上的电流分布，常用的电流密度单位是安培每平方分米(即平方公寸)[ASD]和安培每平方英尺[ASF]。一般情况下，电镀槽液呈酸性，能够腐蚀溶解阴极镀层金属，当电流密度太小时（小于5ASF时），由于酸性槽液的溶解，镀层金属会呈现疏松和无光泽的外观。

Electrotyping (also galvanoplasty) is a chemical method for forming metal parts that exactly reproduce a model. The method was invented by Moritz von Jacobi in Russia in 1838, and was immediately adopted for applications in printing and several other fields. As described in an 1890 treatise, electrotyping produces "an exact facsimile of any object having an irregular surface, whether it be an engraved steel- or copper-plate, a wood-cut, or a form of set-up type, to be used for printing; or a medal, medallion, statue, bust, or even a natural object, for art purposes." In art, several important "bronze" sculptures created in the 19th century are actually electrotyped copper, and not bronze at all; sculptures were executed using electrotyping at least into the 1930s. In printing, electrotyping had become a standard method for producing plates for letterpress printing by the late 1800s. It complemented the older technology of stereotyping, which involved metal casting. By 1901, stereotypers and electrotypers in several countries had formed labor unions around these crafts. The unions persisted into the 1970s, but by the late 20th century, after more than a century in widespread use for preparing plates, the two technologies had been bypassed by the transitions to offset printing and to new techniques for the preparation of printing plates.