Miradouro das Portas do Sol ("Portas do Sol viewpoint") is located at Largo das Portas do Sol, in the neighborhood of Alfama, Lisbon, Portugal. This was the precise location of the medieval gateway called Portas do Sol, one of the main entrances of the wall that protected the Islamic settlement that one dominated this hill, back in the Middle Ages.

This is one of the most famous viewpoints in Lisbon, with great views from Igreja e Mosteiro de São Vicente de Fora ("Church and Monastery of St. Vincent Outside the Walls"), the Alfama neighborhood as a whole with its multiple reddish roofs as well as the Tagus river.