William Alexander, 1st Earl of Stirling (c. 1567 in Menstrie, Clackmannanshire – 12 September 1640) was a Scottish courtier and poet who was involved in the Scottish colonisation of Habitation at Port-Royal, Nova Scotia and Long Island, New York. His literary works include Aurora (1604), The Monarchick Tragedies (1604) and Doomes-Day (1614, 1637).
William Alexander was the son of Alexander of Menstrie and Marion, daughter of an Allan Couttie. As a young man William became tutor to the Earl of Argyll and accompanied him abroad. At a later date he received the place of Gentleman Usher to Prince Charles, son of James I of England (James VI of Scotland), and continued in favour at court after Prince Charles became Charles I of England in 1625. He built a reputation as a poet and writer of rhymed tragedies, and assisted King James I and VI in preparing the metrical version known as "The Psalms of King David, translated by King James" and published by authority of Charles I. James knighted him in 1609 and appointed him the Master of Requests for Scotland in 1614, effectively his private secretary. In 1615 he was made a member of the Scottish Privy Council.
In 1621, King James I granted William a royal charter appointing him mayor of a vast territory which was enlarged into a lordship and barony of Nova Scotia (New Scotland); the area now known as Nova Scotia, New Brunswick, and part of the northern United States. The creation of Baronets of Nova Scotia was used to settle the plantation of the new province.
He was appointed Secretary for Scotland in 1626 and held that office for the rest of his life.
Lord Stirling’s efforts at colonisation were less successful, at least in monetary terms. He briefly established a Scottish settlement at Port Royal, Nova Scotia, led by his son William Alexander (the younger). However the effort cost him most of his fortune, and when the region—now Canada's three Maritime Provinces and the state of Maine—was returned to France in 1632, it was lost. He spent his later years with limited means, and died in London on 12 September 1640. However Alexander's settlement provided the basis for British claims to Nova Scotia and his baronets provided the Coat of arms of Nova Scotia and Flag of Nova Scotia which are still in use today.