William Brouncker, 2nd Viscount Brouncker

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The Right Honourable The Viscount Brouncker
President of the Royal Society
In office 1662–1677
Preceded by	Office established
Succeeded by	Joseph Williamson
Personal details
Born	c. 1620 Castlelyons, Ireland
Died	5 April 1684(1684-04-05) (aged 64) Westminster, London
Residence	England
Alma mater	University of Oxford
Known for	Brouncker's formula, leadership of Royal Society
Scientific career
Fields	Mathematician, civil servant
Institutions	Saint Catherine's Hospital
Academic advisors	John Wallis

William Brouncker, 2nd Viscount Brouncker FRS (c. 1620 – 5 April 1684) was an Anglo-Irish peer and mathematician who served as the president of the Royal Society from 1662 to 1677. Best known for introducing Brouncker's formula, he also worked as a civil servant, serving as a commissioner in the Royal Navy. Brouncker was a friend and colleague of Samuel Pepys, and features prominently in the Pepys' diary.