Marlies Rostock (born April 20, 1960). is a former East German cross-country skier who competed from 1978 to 1980. She won a gold medal in the 4 x 5 km at the 1980 Winter Olympics in Lake Placid, New York. She competended for the SG Dynamo Klingenthal/ Sportvereinigung (SV) Dynamo. Rostock also won a silver medal in the 4 x 5 km at the 1978 FIS Nordic World Ski Championships in Lahti.