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The history of Lisbon, the capital city of Portugal, revolves around its strategic geographical position at the mouth of the Tagus, the longest river in the Iberian Peninsula. Its spacious and sheltered natural harbour made the city historically an important seaport for trade between the Mediterranean Sea and northern Europe. Lisbon has long enjoyed the commercial advantages of its proximity to southern and extreme western Europe, as well as to sub-Saharan Africa and the Americas, and today its waterfront is lined with miles of docks, wharfs, and drydock facilities that accommodate the largest oil tankers.

During the Neolithic period, pre-Celtic peoples inhabited the region; remains of their stone monuments still exist today in the periphery of the city. Lisbon is one of the oldest cities in western Europe, with a history that stretches back to its original settlement by its indigenous peoples, and the eventual establishment of Phoenician and Greek trading posts (c. 800–600 BC), followed by successive occupations in the city of various peoples including the Carthaginians, Romans, Suebi, Visigoths, and Moors. Roman armies first entered the Iberian peninsula in 219 BC, and occupied the city of Olissipo (Lisbon) in 205 BC, after winning the Second Punic War against the Carthaginians. With the collapse of the Roman Empire, waves of Germanic tribes invaded the peninsula, and by 500 AD, the Visigothic Kingdom controlled most of Hispania.

In 711, Muslims, who were mostly Berbers and Arabs from the Maghreb, invaded the Christian Iberian Peninsula, conquering Lisbon in 714. What is now Portugal first became part of the Emirate of Córdoba and then of its successor state, the Caliphate of Córdoba. Despite attempts to seize it by the Normans in 844 and by Alfonso VI in 1093, Lisbon remained a Muslim possession. In 1147, after a four-month siege, Christian crusaders under the command of Afonso I captured the city and Christian rule returned. In 1256, Afonso III moved his capital from Coimbra to Lisbon, taking advantage of the city's excellent port and its strategic central position.