Maurice Fabián 'Mauri' Closs (born 10 June 1971) is an Argentine politician, formerly of the Radical Civic Union (UCR) but now leading the Front for the Renewal of Concord, allied to the Front for Victory in support of President Cristina Fernández de Kirchner. He is a National Senator representing Misiones Province, which he led as governor from 2007 to 2015. Following the election, Rovira appointed Closs as chief of cabinet, and in 2005 he was elected to the Senate for the Front, becoming the youngest senator in the country at age 35. He sat in support of then President Néstor Kirchner.