Clandestine is an adjective meaning that its reference is something secret or guerrilla in nature, such as certain activities executed by spies.

• Clandestine is a novel by James Ellroy.
• Clandestine is an album by Entombed.
• Clandestine chemistry is chemistry carried out in secret.
• Clandestine was a Celtic music band from Houston, Texas.
• ClanDestine is a comic book series by Alan Davis and published by Marvel Comics about a family of British superheroes in the Marvel Universe.
• Clandestino is an album by Manu Chao.
• Clandestiny is an adventure game.