非晶合金变压器(Amorphous Metal Transformer)是一种低损耗、高能效的电力变压器。此类变压器以铁基非晶态金属作为铁芯，由于该材料不具长程有序结构，其磁化及消磁均较一般磁性材料容易。因此，非晶合金变压器的铁损(即空载损耗)要比一般采用硅钢作为铁芯的传统变压器低70-80%。由于损耗降低，发电需求亦随之下降，二氧化碳等温室气体排放亦相应减少。基于能源供应和环保的因素，非晶合金变压器在中国和印度等大型发展中国家得到大量采用。以中印两国目前的用电量来计算，若于配电网全面采用非晶合金变压器的话，每年大约可节省25-30TWh发电量，以及减少2至3千万吨二氧化碳排放。

An amorphous metal transformer (AMT) is a type of energy efficient transformer found on electric grids. The magnetic core of this transformer is made with a ferromagnetic amorphous metal. The typical material (Metglas) is an alloy of iron with boron, silicon, and phosphorus in the form of thin (e.g. 25 µm) foils. These materials have high magnetic susceptibility, very low coercivity and high electrical resistance. The high resistance and thin foils lead to low losses by eddy currents when subjected to alternating magnetic fields. On the downside amorphous alloys have a lower saturation induction and often a higher magnetostriction compared to conventional crystalline iron-silicon electrical steel .