Lewis Watson, 1st Baron Sondes

Lewis Watson, 1st Baron Sondes (28 November 1728 – 30 March 1795), called Hon. Lewis Monson before 1746 and Hon. Lewis Watson from 1746 to 1760, was a British Whig politician and peer.

Sondes was the second son of John Monson, 1st Baron Monson and Lady Margaret Watson, youngest daughter of Lewis Watson, 1st Earl of Rockingham. He was educated at Westminster School between 1737 and 1745. He assumed the surname of Watson in 1746 after inheriting the estates of his cousin, Thomas Watson, 3rd Earl of Rockingham. Watson afterwards went on the Grand Tour with his second cousin the Earl of Malton (later Marquess of Rockingham) and his third cousin Thomas Pelham.

While abroad in Europe in 1750, his third cousin once removed, the Duke of Newcastle, arranged for Watson to be returned in April as Member of Parliament for Boroughbridge in place of Earl of Dalkeith, who had died. That autumn, the three kinsmen visited Hanover, where Newcastle presented them, together with Viscount Downe and three other young Englishmen, to George II of Great Britain, who was holding court in the Electorate. The king was not pleased and snubbed the party when they were presented.

On 12 October 1752 he married his third cousin Grace Pelham (d. 30 July 1777), the third surviving daughter and co-heiress of Prime Minister Henry Pelham, Newcastle's brother. They had four sons:

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