The Diamond Smugglers is a non-fiction work by Ian Fleming that was first published in 1957 in the United Kingdom and in 1958 in the United States. The book is based on two weeks of interviews Fleming undertook with John Collard, a member of the International Diamond Security Organisation (IDSO), which was headed by Sir Percy Sillitoe, the ex-chief of MI5 who worked exclusively for the diamond company De Beers.