The Sinai Peninsula or Sinai (Arabic: سيناء‎ sīnā' ; Hebrew סיני) is a triangular peninsula in Egypt about 60,000 km² (23,000 sq mi) in area. It is situated between the Mediterranean Sea to the north, and the Red Sea to the south, and is the only part of Egyptian territory located in Asia as opposed to Africa, effectively serving as a land bridge between two continents. The bulk of the peninsula is divided administratively into two of Egypt's 27 governorates (with three more straddling the Suez Canal area), and has a population of approximately 500,000 people. In addition to its formal name, Egyptians also refer to it affectionately as the "Land of Fayrouz", based on the Ancient Egyptian "Dumafkat", which has the same meaning.

The region has historically been the centre of conflict between various states, based largely on its strategic geopolitical location. In addition to periods of direct rule by Egyptian governments (including the Ayyubids, the Mamluks, the Muhammad Ali Dynasty, and the modern Egyptian republic), it was like the rest of Egypt, also occupied and controlled by the Ottoman Empire, and the United Kingdom (which occupied Egypt from 1882 until 1956). Israel invaded and occupied Sinai during the Suez Crisis (known in Egypt as the Tripartite Aggression) of 1956, and during the Six Day War of 1967. On 6 October 1973, Egypt launched the October War to liberate the peninsula, which was the site of fierce fighting between Egyptian and Israeli forces. In 1982, after the Israel-Egypt Peace Treaty of 1979, Israel withdrew from the entirety of Sinai. Today, Sinai has become a tourist destination due to its natural setting, rich coral reefs, and biblical history. Mount Sinai is one of the most religiously significant places in Abrahamic faiths.