Fremantle is a surname. Notable people with the surname include:
Thomas Fremantle (Royal Navy officer) (1765–1819), Admiral of the Royal Navy
William Fremantle (politician) (1766–1850), British politician
Elizabeth Wynne Fremantle (1778–1857), British diarist and wife of Admiral Thomas Fremantle
Thomas Fremantle, 1st Baron Cottesloe (1798–1890) British politician
William Fremantle (uncle) (1807–1895), Dean of Ripon, brother of the 1st Lord Cottesloe
Charles Fremantle (1800–1869), Captain of the first ship to arrive at the Swan River, Western Australia, in 1829 to establish a colony
Thomas Fremantle, 2nd Baron Cottesloe (1830–1918), British businessman and Conservative politician
William Fremantle (nephew) (1831–1916), Dean of Ripon, son of the 1st Lord Cottesloe
Arthur Fremantle (1835–1901), British soldier and American Civil War diarist
Edmund Fremantle (1836–1929), British Navy officer
Thomas Fremantle, 3rd Baron Cottesloe (1862–1956), Australian army officer
Sydney Fremantle (1867–1958), Admiral of the Royal Navy
John Fremantle, 4th Baron Cottesloe (1900–1994), World War II soldier and businessman
John Fremantle, 5th Baron Cottesloe (b. 1927), Commander of the Royal Navy
Francesca Fremantle, scholar and translator of Sanskrit
