Clandestine (novel), a novel by James Ellroy

Clan Destine, a comic book series by Alan Davis and published by Marvel Comics about a family of British superheroes in the Marvel Universe

Clandestine chemistry, chemistry carried out in secret

Clandestine MUD, a MUD, or text-based MMORPG

Clandestine, a short film by the band AFI, featured on the special edition of the album Sing the Sorrow

National Clandestine Service, formerly the CIA's Directorate of Operations

Clandestine (band), a Celtic music band from Houston, Texas

La Clandestine Absinthe, an absinthe distilled in Switzerland

Clandestine Insurgent Rebel Clown Army (CIRCA), an antimilitarist British action group of clowns dressed in army uniforms

Clandestiny, an adventure game

Clandestine (album), an album by Entombed

Clandestine operation, a secret military or political activity

Clandestino, an album by Manu Chao

Clandestinity (canon law), an impediment to marriage in the canon law of the Roman Catholic Church