Alain-Emmanuel de Coëtlogon (4 December 1646 – 6 June 1730) was a Marshal of France during the reign of Louis XIV and Louis XV. He was born at Rennes, the seventh son of Louis de Coëtlogon, vicomte de Méjusseaume (d.1657), counsellor to the King in the Parlement of Brittany, and Louise Le Meneust de Bréquigny. He enjoyed an excellent education in Rennes, and joined a military academy, where he graduated in 1668. Several ships were named after Coëtlogon, especially a frigate which was active during the Boshin war (1868–1869) in Japan, and later an armoured cruiser.