James Watney 918 December 1800–16 March 1884) was a brewer and landowner who resided at Haling Park, Croydon, and Beddington, Surrey. He was born to Daniel Watney (1771–1831) of Mitcham, Surrey and Mary Galpin (1771–1830), daughter of James Galpin (died 1789) of Mitcham, Surrey. He was the grandson of John Watney (1747–1814) and great-grandson of Daniel Watney (1705–1780) of Wimbledon, Surrey.
The Watney family were the main partners in the Stag Brewery of Pimlico for much of the 19th century. In 1837, James Watney became a partner in the brewery with John Lettsom Elliot and Charles Lambert, as later did his sons James and Norman in 1856. The brewery was known as Elliot, Watney & Co from about 1849. John L Elliot withdrew from the business in 1850, and for 8 years remained a partner in name only. He finally retired in 1858 and the firm became known as James Watney & Co. James Watney then kept the management almost entirely to himself until his death, at well over eighty years, in 1884. After his death in 1884, Watney & Co Ltd became a private limited company in 1885.
In 1898, it acquired Messrs. Combe Delafield and Co. and Messrs. Reid and Co., and was thereafter known as Messrs. Watney Combe & Reid.
James Watney was Master of the Mercers' Company in 1846, but had few other interests outside business.
James Watney contributed several thousands of pounds towards building a new church just as his father had done at Mitcham.
On 15 October 1829, at St. Saviour's Church, Southwark (now Southwark Cathedral), James Watney married Rebecca Spurrell, elder daughter of the brewer and hop merchant James Spurrell, of Park Street, Southwark, who was employed by Barclay & Perkins's Anchor Brewery, Southwark.