L'Isle-d'Abeau (French pronunciation: [lil dabo]; Arpitan: L'Ila-d'Âbél) is a commune in the Isère department in the Auvergne-Rhône-Alpes region in Southeastern France. It lies 35 kilometres (21.7 miles) southeast of Lyon. It is part of the urban unit (agglomeration) of Bourgoin-Jallieu, as well as of the larger functional area of Lyon.

The new town of L'Isle-d'Abeau was developed from 1970 to canalise the demographic growth of the Lyon agglomeration. It is organised in a New Agglomeration Union, together with the neighbouring communes of Four, Saint-Quentin-Fallavier, Vaulx-Milieu and Villefontaine. Since 1 January 2007, the Union became the Communauté d'agglomération Porte de l'Isère, with over 106,000 inhabitants in 22 communes.

The commune has eight primary schools (one is private), three middle schools, one high school, in addition to two IUT facilities dedicated to informatic and multimedia jobs. It is served by the A43 autoroute and L'Isle-d'Abeau station on the line from Lyon-Perrache station to Marseille-Saint-Charles station via Grenoble, operated by the SNCF.

Historical population

Year	Pop.	±% p.a.
1968	725	—
1975	897	+3.09%
1982	1,290	+5.33%
1990	5,554	+20.02%
1999	12,034	+8.97%
2009	15,373	+2.48%
2014	16,040	+0.85%
2020	16,717	+0.69%
Source: INSEE

L'Isle-d'Abeau is twinned with:

• San Vicente del Raspeig (Alicante, Spain)

• Communes of the Isère department

• (in French) Official website