复制（英文：Copying）是将某事物通过某种方式制作成相同的一份或多份的行为。在中文里，台湾和港澳地区亦将英文中表示利用生物技术由无性生殖产生与原个体有完全相同基因组之后代过程的“clone”一词翻译作“复制”（参看选殖）。

对于作品的复制，概念上有狭义和广义的区别。狭义的复制，是通过印刷、照相、复写、录音、录像等行为的复制；而广义的复制，还包括了对作品的某些改变，形态上产生了变化，但实质上仍然是同样的，例如将小说改编成剧本，不同语言之间的翻译等，以及把其中一家唱片公司之作交予其他唱片公司制作。

Copying is the duplication of information or an artifact based only on an instance of that information or artifact, and not using the process that originally generated it. With analog forms of information, copying is only possible to a limited degree of accuracy, which depends on the quality of the equipment used and the skill of the operator. There is some inevitable deterioration and accumulation of "noise" (random small changes, not sound) from original to copy; when successive generations of copy are made, this deterioration accumulates with each generation. With digital forms of information, copying is perfect. Copy and paste is frequently used for information a computer user selects and copies to an area he or she wishes.