Sir Martin Le Quesne KCMG (10 June 1917 – 3 April 2004) was a British diplomat, ambassador to Mali and Algeria and high commissioner to Nigeria.
He served at Baghdad, Bahrain and Rome, and in the Foreign Office (later the Foreign and Commonwealth Office, FCO), before being appointed chargé d'affaires in Mali when that country gained independence from France in 1960; subsequently he was Ambassador there 1961–64.
His time in Nigeria was brought to an unlucky end by an attempted military coup by Lt. Col. Buka Suka Dimka, who ambushed and assassinated the president, Murtala Mohammed on 13 February 1976.
Dimka then visited Le Quesne and asked him to relay a message to General Gowon in London.
Le Quesne refused, but the visit had compromised his position and he was expelled by Mohammed's successor, Olusegun Obasanjo.