Coëtlogon can refer to:
Alain Emmanuel de Coëtlogon, Marshal of France Marine de Carné de Trécesson de Coëtlogon, French diplomat Coëtlogon, Côtes-d'Armor, a French commune Coëtlogon, a French Navy frigate under the command of Abel-Nicolas Bergasse du Petit-Thouars during the Boshin war in Japan.