Cugnon () is a village of Wallonia and a district of the municipality of Bertrix, located in the province of Luxembourg, Belgium.
It was a municipality in its own right before a merger in 1977. Cugnon merged under the French regime with , Géripont and Mortehan. It was separated from Auby-sur-Semois on 30 July 1899 and in 1964 annexed the hamlet of Thibauroche, detached from Muno.
Cugnon comes from the following:
Chez (Latin casae âÂÂat homeâ = French chez) Congidunus (Celtic surname, cf. the Breton king Cogidunus cited by Tacitus in Agricola, or the Gallic Conconnetodunnus, cited by L. Roger; this name contains the Gallic duno âÂÂpregnantâ and the Celtic adjective connios âÂÂclever, endâÂÂ).