Longitude 78 West is a script that was written by Ian Fleming, Kevin McClory and Jack Whittingham circa 1958 as a proposed James Bond movie. It was originally planned to be produced by Xanadu Productions, a company set up by Fleming, McClory, Whittingham, and Ernest Cuneo; however the production folded due to funding issues and producers Cuneo and Ivar Bryce backed out. Though unproduced, the story from the script would be reused by Fleming as his book Thunderball, which would in turn inspire two James Bond films - 1965's Thunderball and 1983's Never Say Never Again. The screenplay is also notable for - according to some sources - introducing Bond to the crime organisation SPECTRE, which would go on to feature prominently in both the novel series, and later the film series.
In 2013, a copy of the script was sold at auction for €11,383.