This article is about the Egyptian city. For other meanings, see Alexandria (disambiguation).

Alexandria or Alexandria (Ancient Greek Ἀλεξάνδρεια Alexándreia, after Alexander the Great; Arabic الإسكندرية al-Iskandariyya) is Egypt's second-largest city after Cairo, with a population of over 5 million (as of 2017) and an extension of 32 kilometres along the Mediterranean coast, and the largest Egyptian city overall with direct access to the Mediterranean Sea. It has the largest seaport in the country, handling about 80% of Egypt's foreign trade. As an important industrial location, it is supplied with crude oil and natural gas from Suez via pipelines.

Alexandria was founded in 331 BC by the ruler Alexander the Great on the site of the ancient Egyptian settlement of Rhakotis and completed under Ptolemy II between 285 and 247 BC. The city developed into an important center of the Hellenistic world as well as of Roman and Byzantine Egypt. It was the capital of the province of Aegyptus, and later of the Dioecesis Aegypti. Ancient Alexandria was best known for its lighthouse (Pharos), one of the Seven Wonders of the Ancient World, and for its Great Library. It lost its importance after the Islamic conquest of Egypt in 641 AD and with the founding of Cairo. Reduced to a fishing village cut off from the hinterland in the early 19th century, Alexandria managed to re-emerge as a major international trading centre thanks to the construction of the Mahmudiya Canal and the flourishing of the lucrative Egyptian cotton trade.

Since 1994, underwater archaeological investigations have been taking place in the port of Alexandria, which have led to new insights into the predecessor settlement of Rhakotis and the Ptolemaic era.