{{language |site=http://wiki.wesnoth.org/ReferenceWML |tags=wml |hopl=no }} ''Wesnoth Markup Language'' or '''WML''' is the configuration format for its computer game, [http://www.wesnoth.org/ ''the Battle for Wesnoth'']. WML files are plain text and consist of tags; and tags can contain key-value pairs and nested tags. WML describes parts of the game, such as units (like Elvish Fighters and Orcish Grunts) that do battle, and scenarios where armies must fight.

[http://wiki.wesnoth.org/ActionWML ActionWML] responds to events during a scenario. ActionWML qualifies WML as a scripting language. The actions include modifying units, displaying message boxes, accessing variables, using [if] and [while] control structures, and so on.

WML also includes a few sub-languages:

• [http://wiki.wesnoth.org/PreprocessorRef WML Preprocessor] allows macros in WML files. Macros are good for brevity, because a one-line macro might expand to a multi-line tag. Wesnoth also has many predefined macros.
• [http://wiki.wesnoth.org/FormulaAI FormulaAI] is a pure functional language. Its purpose is to customize AI of armies under computer control, but it can also do arithmetic and define functions.
• [http://wiki.wesnoth.org/LuaWML LuaWML] embeds [[:Category:Lua|Lua]] inside WML. This is also the only way to define a custom WML tag.