Coincy is a French surname and a place name. It may refer to:
People
- Gautier de Coincy (1177–1236), French abbot, poet, and musical arranger
- Jean-Baptiste de Coincy [fr] (1709-1797), Lieutenant-General of the French Royal Armies, Commander of the Royal and Military Order of Saint Louis.
- Auguste-Henri de Coincy (1837–1903), French botanist, whose name is commemorated by the Coincya genus and the "Prix de Coincy [fr]".
Places
- Coincy Aerodrome, French World War I airfield near Aisne
- Coincy, Aisne, French commune in the department of Aisne
- Coincy, Moselle, French commune in the department of Moselle
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