Sir William Davenant (baptised 3 March 1606 – 7 April 1668), also spelled D'Avenant, was an English poet and playwright. Along with Thomas Killigrew, Davenant was one of the rare figures in English Renaissance theatre whose career spanned both the Caroline and Restoration eras and who was active both before and after the English Civil War and during the Interregnum.

Davenant was reportedly a godson of fellow playwright William Shakespeare, and he wrote a memorial ode for his godfather when he was only 12-years-old. Later in life, he was rumored to be Shakespeare's illegitimate son. In 1638, Davenant replaced Ben Jonson as the new Poet Laureate. Davenant was a Royalist in the English Civil War and was sentenced to death by the Parliamentarians in 1650. His life was reportedly spared by the intervention of a fellow writer, John Milton.