Sir Walter Ralegh (; c. 1552 – 29 October 1618), also spelled Raleigh, was an English statesman, soldier, writer, explorer, and a favorite client of the English Queen Elizabeth I. One of the most notable figures of the Elizabethan era, he played a leading part in English colonisation of North America, suppressed rebellion in Ireland, helped defend England during the Spanish Armada and held political positions under Elizabeth I.

Raleigh was born to a Protestant family in Devon, the son of Walter Raleigh and Catherine Champernowne, and a cousin of Sir Richard Grenville and younger half-brother of Sir Humphrey Gilbert. Little is known of his early life, though in his late teens he spent some time in France taking part in the religious civil wars. In his 20s he took part in the suppression of rebellion in the colonisation of Ireland; he also participated in the siege of Smerwick. Later, he became a landlord of property in Ireland and mayor of Youghal in East Munster, where his house still stands in Myrtle Grove. He rose rapidly in the favour of Queen Elizabeth I and was knighted in 1585. He was granted a royal patent to explore Virginia, paving the way for future English settlements. In 1591, he secretly married Elizabeth Throckmorton, one of the Queen's ladies-in-waiting, without the Queen's permission, for which he and his wife were sent to the Tower of London. After his release, they retired to his estate at Sherborne, Dorset.

In 1594, Raleigh heard of a "City of Gold" in South America and sailed to find it, publishing an exaggerated account of his experiences in a book that contributed to the legend of "El Dorado". After Queen Elizabeth died in 1603, Raleigh was again imprisoned in the Tower, this time for being involved in the Main Plot against King James I, who was not favourably disposed towards him. In 1616, he was released to lead a second expedition in search of El Dorado. During the expedition, men led by his top commander ransacked a Spanish outpost, in violation of both the terms of his pardon and the 1604 peace treaty with Spain. Raleigh returned to England and, to appease the Spanish, he was arrested and executed in 1618.