安装程序（或称安装软件）是电脑软件的一种，用以协助用户安装其他软件或驱动程序。安装程序的文件名称常见有「setup」、「install」、「installer」、「installation」等字样。

安装程序通常也会同时提供移除程序（或称反安装程序）以协助用户将软件自电脑中删除。移除程序的文件名称常为「uninstall」、「uninstaller」等。

Windows系统有提供一个称为「添加与移除程序」的共用接口，内有大多数已安装软件的列表。通常安装程序都会在安装的同时将自己与自己的移除程序列表于其中。

Installation (or setup) of a computer program (including device drivers and plugins), is the act of making the program ready for execution. Because the process varies for each program and each computer, programs (including operating systems) often come with an installer, a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process.