Sir John Tomlinson Brunner, 1st Baronet (8 February 1842 – 1 July 1919) was a chemical industrialist and Liberal Party politician.
Born in Liverpool, he worked at Hutchinson's alkali works in Widnes, rising to general manager. In 1873, in partnership with Ludwig Mond, he started the chemical company Brunner Mond & Co. at Winnington near Northwich, initially making alkali by the Solvay process. It became the wealthiest British chemical company of the late 19th century and, after Brunner's death, was one of the four companies that merged to found Imperial Chemical Industries (ICI).
Brunner represented Northwich in Parliament in 1885–86 and 1887–1910. He was a prominent Freemason, a paternalistic employer and a generous benefactor to the towns in his constituency and to the University of Liverpool. He is the great grandfather of HRH The Duchess of Kent.