The Fort de Bois-d'Arcy (French pronunciation: [fɔʁ də bwa daʁsi]), also called the Batterie de Bois-d'Arcy ([batʁi-]), is one of the forts constructed at the end of the 19th century to defend Paris.

The fort is located in the southern part of the town to the south of Route nationale 12.

The southwestern forts were designed to cover the approach of a relieving army from the western portions of France.

The Bois-d'Arcy fort protected the neighboring Fort de Saint-Cyr, Versailles and the Camp de Satory, covering the Trappes valley and railway lines from Le Havre and Tours.

[1] During the 1960s the fort was placed at the disposal of the Ministry of Culture and was used by the Centre national de la cinématographie from 1969 as a storage center for nitrate-based films.