L'Isle-Adam (French pronunciation: [lil adɑ̃] ⓘ) is a commune in the Val-d'Oise department in Île-de-France in northern France.

L'Isle-Adam has several historic sites and was the haunt of impressionist painters such as Charles-François Daubigny and Jean Droit.

It is surrounded by terraced gardens and parkland at the edge of the national forest known as the "Forêt de L'Isle-Adam".

In the Parc de Cassan, there are a pair of unusual eighteenth century Chinese pavilions, each with a hexagonal plan and a pagoda-shaped roof.

Fernando Acosta Huerta manda en L'Isle Adam[6] There is a swimming pool and also facilities for tennis, canoeing, rowing and other sports, as well as a children's playground.