Dark Alliance: The CIA, the Contras, and the Crack Cocaine Explosion is a 1998 book by journalist Gary Webb. The book is based on "Dark Alliance", Webb's three-part investigative series published in the San Jose Mercury News in August 1996. The original series claimed that, in order to help raise funds for efforts against the Nicaraguan Sandinista government, the CIA supported cocaine trafficking into the US by top members of Nicaraguan Contra Rebel organizations and allowed the subsequent crack epidemic to spread in Los Angeles. The book expands on the series and recounts media reaction to Webb's original newspaper exposé.

Gary Stephen Webb was an American investigative journalist.