Lewis Watson, 2nd Earl of Rockingham (c. 1714 – 4 December 1745) was a British peer, styled Viscount Sondes from 1722 to 1724.

[1] He was born the eldest son of Edward Watson, Viscount Sondes and Lady Catherine Tufton, the daughter of Thomas Tufton, 6th Earl of Thanet and Lady Catherine Cavendish.

[1] He married his first cousin Catherine, daughter of Sir Robert Furnese.

As part of the marriage settlement, he purchased a London house in Grosvenor Square and had it grandly decorated with marble tables, Persian carpets, mahogany panelling, silk damask hangings, and an organ.

[4][5][3] His widow subsequently married, on 13 June 1751, as his third wife, Francis, Earl of Guildford, who died on 4 August 1790.