Mário Sérgio Quaresma Gonçalves Marques (Funchal, February 25, 1957), known as Sérgio Marques, is a Portuguese lawyer and politician, currently a member of the Assembly of the Republic.
He was the Regional Secretary of Parliamentary and European Affairs in the Regional Government of Madeira, between 2015 and 2017, in the first regional government led by Miguel Albuquerque.
He was also a member of the European Parliament for the PPD/PSD from 1999 to 2009, when he refused to reinstate the lists due to disagreement with the then chairman of the PPD/PSD-Madeira Political Commission and president of the Regional Government of Madeira, Alberto João Jardim.