Nong'an is a county of Jilin Province in Northeast China, under the administration of the prefecture-level city of Changchun, the provincial capital. It is the westernmost county-level division of Changchun City.
The county borders Dehui to the east and the Kuancheng and Lüyuan Districts to the southeast. To the southwest it borders the prefecture-level city of Siping, and to the northwest the prefecture-level city of Songyuan.