LAMP is an acronym for a solution of open source software, originally coined from the first letters of Linux (operating system), Apache HTTP Server, MySQL (database software), and PHP, principal components to build a viable general purpose web server.

The precise combination of software included in a LAMP may vary, especially with respect to the web scripting software, as PHP may be replaced by Perl or Python. Similar terms exist for essentially the same software suite (AMP) running on other operating systems, such as MS Windows (WAMP), Mac OS (MAMP), Solaris (SAMP), or OpenBSD (OpAMP).