Baron Louis de Cartier de Marchienne (Turnhout, 26 September 1921 – 21 May 2013) was a Belgian businessman.
He was managing director of the company Eternit in the 1960s, and in 1971 he became Chairman of the Board of the printing company Brepols and led the company through a period of change.
His son Jean-Louis de Cartier de Marchienne is a member of the board of Carta Mundi.