Henry Grey, 1st Duke of Kent (1671-1740), was a British courtier.

He succeeded his father as 12th Earl of Kent in 1702, having succeeded his mother as 2nd Baron Lucas earlier the same year. He was made Lord Chamberlain and a Privy Counsellor in 1704. He was created Marquess of Kent, Earl of Harold and Viscount Goderich in 1706, Duke of Kent in 1710, and made a Knight of the Garter in 1712. Having been succeeded as Lord Chamberlain by the Duke of Shrewsbury in 1714, he served as Lord Steward from 1716 until 1718, and Lord Privy Seal from 1719 until 1720.

Left without a male heir after the death of his son George, Earl of Harold, in 1733, he was created Marquess Grey in 1740, with a special remainder to his grand-daughter Lady Jemima Campbell and her heirs male. She also succeeded to the Barony of Lucas. All his other titles became extinct at his death.

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Kingston | width="40%" style="text-align: center;" |Lord Privy Seal
1719–1720 | width="30%" |Succeeded by:
The Duke of Kingston