Sir John Trevelyan, 4th Baronet (6 February 1735 – 18 April 1828) was a British politician who sat in the House of Commons from 1777 to 1796.
A member of an ancient family of Cornwall, he was the only son and heir of Sir George Trevelyan, 3rd Baronet (1707–1768) of Nettlecombe.
In 1784 he was a member of the St. Alban's Tavern group who tried to bring Fox and Pitt together.
[2] In 1835 his family received compensation of £26,898, a huge sum at the time, from the British government for the abolition of slavery a year earlier.
[1] By his wife he had 6 sons and 2 daughters[1] including: He died in April 1828, aged 93.