Heerlen (Dutch pronunciation:[ˈɦeːrlə(n)]; Limburgish:Heële) is a city and a municipality in the southeast of the Netherlands. It is the fourth largest municipality in the province of Limburg.
Heerlen forms part of Parkstad Limburg, formerly known as Oostelijke Mijnstreek (Eastern Coal Mining District), an agglomeration with about 220,000 inhabitants.