Cathy Rosier (January 2, 1945 in Fort-de-France – May 17, 2004) was a model and actress, who was born in Martinique, French West Indies, and died in Marrakech, Morocco, from a ruptured aorta.

She is perhaps best known for her role as the pianist Valerie in Jean-Pierre Melville's Le Samouraï (1967).