The Arrondissement of Roermond was an arrondissement of the United Kingdom of the Netherlands until the Treaty of London in 1839. It was a part of the Province of Limburg, which also included the Hasselt and Maastricht. It was centred on the city of Roermond. After the Belgian Revolution and the Treaty of London, the arrondissement was split between the Netherlands and Belgium. The Belgian portion formed the rump of the new arrondissement of Maaseik (which also absorbed the canton of Peer from Hasselt).