Lieutenant-General William Keppel (5 November 1727 – 1 March 1782) was a British Army officer and politician.

He joined the British Army as an Ensign in the 2nd Foot Guards in 1744, and was promoted to the rank of lieutenant in 1745.

He transferred as captain-lieutenant to the 1st Foot Guards in 1751, and was promoted captain and lieutenant-colonel in 1752 and a colonel of the Army in 1760.

[1] In 1762, he took part (with his brothers the Earl of Albemarle and Augustus Keppel) in the British expedition against Cuba, and directed the storming of Morro Castle.

He was Gentleman of the Horse to King George III of Great Britain and died unmarried in 1782.