William Paget, 6th Baron Paget (10 February 1637 – 26 February 1713) was an English peer and ambassador. He was the eldest son of William Paget, 5th Baron Paget and Lady Isabella Rich, daughter of Henry Rich, 1st Earl of Holland. Lord Paget married twice, firstly to Frances Pierrepont, daughter of Francis Pierrepont and Elizabeth Bray, by whom he had a son and heir Henry Paget, 1st Earl of Uxbridge. He married secondly his cousin Isabella Irby, daughter of Sir Anthony Irby and Paget's aunt Catherine Paget.