Law
* Violation of law **Entertainment
* ''The Illegal'' (novel) (2015), by Canadian writer Lawrence Hill * '' Illegal - Justice, Out of Order'', an Indian web seriesFilms
* ''Illegal'' (1932 film), British * ''Illegal'' (1955 film), American * ''Illegal'' (2010 film), Belgian * ''The Illegal'' (2019), film starringBands
* Illegal (group), a 1990s rap group * Los Illegals, a music bandSong
* "Illegal" (Shakira song), 2005 * "Illegal" (PinkPantheress song), 2025Food and drink
* Ilegal Mezcal, a brand of mezcal from Guatemala ** Illegal (cocktail), a cocktail made with Ilegal MezcalSee also
* * ''Illegal agent'', also known as Operational cover * Illegals Program, Russian spies arrested in the United States in 2010 * The Illegal (disambiguation) * Illegalism, an anarchist philosophy which embraced criminality as a lifestyle {{disambiguation