The early Muslim conquests or early Islamic conquests, also known as the Arab conquests, were initiated in the 7th century by Muhammad, the founder of Islam. He established a new unified polity in Arabia that expanded rapidly under the Rashidun Caliphate and the Umayyad Caliphate, culminating in Muslim rule being established on three continents over the next century. According to Scottish historian James Buchan: "In speed and extent, the first Arab conquests were matched only by those of Alexander the Great, and they were more lasting."

The Arabian Peninsula, or Arabia, is a peninsula in West Asia, situated northeast of Africa on the Arabian Plate. At 3,237,500 km2 (1,250,000 sq mi), comparable in size to India, the Arabian Peninsula is the largest peninsula in the world.