Marino Ghislainus Keulen (born 24 October 1963) is a Belgian politician from Flanders and a member of the Open Flemish Liberals and Democrats party.
He obtained a (graduate) degree at the Provinciaal Hoger Handelsinstituut in Hasselt.
Keulen served in the provincial council of Limburg 1994–1995 but gave up the seat when he was elected to the Flemish Parliament in 1995.
After the regional elections of 2004, Keulen became Flemish Minister for Home Affairs, Urban Policy, Housing and Civic Integration.
Keulen was elected to the municipal council of Lanaken in 1988 and was re-elected in 1994, 2000 and 2006.