Forte da Casa is a town and former civil parish in the municipality of Vila Franca de Xira, Portugal.

Since 2013, it is part of the civil parish Póvoa de Santa Iria e Forte da Casa.

[2] The town of Forte da Casa takes its name from the Fort of Casa, a fortification that was part of the second line of the Lines of Torres Vedras, built between 1809 and 1810 to defend Lisbon against the French troops during the Peninsular War.

After a sharp population increase in the 1970s and 1980s, the civil of parish of Forte da Casa was created on 12 July 1985.

[4] In November 2014, Forte da Casa was one of the locations most affected by a Legionella outbreak in the Vila Franca de Xira municipality.