The Mission Song is a thriller/espionage novel by British writer John le Carré, published in 2006. Set against the background of the chaotic East Congo, the story involves the planning of a Western-backed coup in the province of Kivu, told from the worm's-eye view of the hapless interpreter. Although the events are fictional, the book evokes a rich and detailed picture of the political and ethnic tensions of the region, highlighting the greed and amorality of local bureaucrats and Western interests, and calling attention to the apathy of the British press about the continuing humanitarian crisis of the Congo War.

David John Moore Cornwell, better known by his pen name John le Carré, was a British author, best known for his espionage novels, many of which were successfully adapted for film or television. A "sophisticated, morally ambiguous writer", he is considered one of the greatest novelists of the postwar era. During the 1950s and 1960s, he worked for both the Security Service (MI5) and the Secret Intelligence Service (MI6). Near the end of his life, due to his strong disapproval of Brexit, he took out Irish citizenship, which was possible due to his having an Irish grandparent.