Thomas Herbert, 8th Earl of Pembroke

The Right Honourable The Earl of Pembroke and Montgomery KG PC
Thomas Herbert by John Greenhill
First Lord of the Admiralty
In office 1690–1692
Monarch	William III and Mary II
Preceded by	The Earl of Torrington
Succeeded by	The Lord Cornwallis
Lord Privy Seal
In office 1692–1699
Preceded by	In Commission Last held by Lord Halifax
Succeeded by	The Viscount Lonsdale
Lord President of the Council
In office 18 May 1699 – 29 January 1702
Monarch	William III
Preceded by	The Duke of Leeds
Succeeded by	The Duke of Somerset
In office 9 July 1702 – 25 November 1708
Monarch	Anne
Preceded by	The Duke of Somerset
Succeeded by	The Lord Somers

Thomas Herbert, 8th Earl of Pembroke and 5th Earl of Montgomery KG PC PRS (c. 1656 – 22 January 1733), styled The Honourable Thomas Herbert until 1683, was an English and later British statesman during the reigns of William III and Anne.

Herbert was the third son of Philip Herbert, 5th Earl of Pembroke and his wife Catharine Villiers, daughter of Sir William Villiers, 1st Baronet. He was educated at Tonbridge School, Kent. Both of his brothers (the 6th Earl and the 7th Earl) having died without a male heir, he succeeded to the earldoms in 1683.

From 1690 to 1692 Pembroke was First Lord of the Admiralty. He then served as Lord Privy Seal until 1699, being in 1697 the first plenipotentiary of Great Britain at the congress of Ryswick. On two occasions he was Lord High Admiral for a short period; he was also Lord President of the Council and Lord Lieutenant of Ireland, while he acted as one of the Lords Justices seven times; and he was President of the Royal Society in 1689–1690. He is the dedicatee of John Locke's An Essay Concerning Human Understanding and Thomas Greenhill's The Art of Embalming.