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