Santos-o-Velho is a former freguesia of Lisbon, Portugal, with an area of 0.51 km2 and 4,013 inhabitants. It has a population density of 7899.6 inhabitants/km2. At the administrative reorganization of Lisbon on 8 December 2012 it became part of the parish Estrela. It is one of the best preserved historical parts of Lisbon, including Madragoa, the Museum of Ancient Art, and many former convents and palaces.