David Cecil, 3rd Earl of Exeter (c. 1600–1643) was an English peer and member of the House of Lords.
David Cecil was the son of Sir Richard Cecil of Wakerley, Northamptonshire. He was educated at Clare College, Cambridge, and admitted at Lincoln's Inn in 1627.[1] In 1640, he sat for Peterborough in the Short Parliament. He inherited the earldom in July 1640 from his uncle William Cecil, 2nd Earl of Exeter.
He married Elizabeth Egerton (d. 1688), daughter of John Egerton, 1st Earl of Bridgewater. Their daughter, Lady Frances Cecil (1633–1652), married Anthony Ashley Cooper, 1st Earl of Shaftesbury. He was succeeded by his son John Cecil, 4th Earl of Exeter.