SMW may refer to: Semantic MediaWiki, an extension to MediaWiki that allows for annotating semantic data within wiki pages Smara Airport, Western Sahara, IATA Airport Code Smoky Mountain Wrestling, a professional wrestling promotion that held events in the Appalachian area Special marine warning, a warning issued by the National Weather Service to warn of strong or severe storms over a marine area such as a lake or an ocean Super Mario World, a 1990 platformer by Nintendo for the Super Nintendo Entertainment System