The canton of Montreuil is a former canton in the Pas-de-Calais department and the Nord-Pas de Calais region. It was disbanded following the French canton reorganisation that came into effect in March 2015. It had a total of 22,203 inhabitants (2012).

An area of drained marshland and one or two hills, with the town of Montreuil in the Arrondissement of Montreuil at its centre. The altitude varies from 1 m (3 ft 3 in) in Le Touquet-Paris-Plage to 100 m (330 ft) in Neuville-sous-Montreuil, with an average altitude of 74 m (243 ft).

The canton comprised 17 communes:

Population Growth

1962	1968	1975	1982	1990	1999
15,953	17,328	19,139	19,960	20,942	21,603
Census count starting from 1962 : Population without double counting

• Arrondissements of the Pas-de-Calais department
• Cantons of the Pas-de-Calais department
• Communes of the Pas-de-Calais department

50°27′52″N 1°45′51″E / 50.46444°N 1.76417°E / 50.46444; 1.76417