Marie-Thérèse Gantenbein-Koullen (born 28 August 1938 in Tétange) is a retired Luxembourgish politician for the Christian Social People's Party. She was a member of the Chamber of Deputies, representing the constituency of Centre from 2004 until 2009, when she retired, to be replaced by . In addition to sitting in the Chamber, she was a member of Hesperange's communal council for twenty-one years (1988–2009), including almost three as échevin (1997–1999), and, finally, over nine as (1999–2009).