Thomas Fremantle may refer to:
Thomas Fremantle (Royal Navy officer) (1765–1819), British admiral and friend of Lord Nelson Thomas Fremantle, 1st Baron Cottesloe (1798–1890), Conservative politician Thomas Fremantle, 2nd Baron Cottesloe (1830–1918), British businessman and politician Thomas Fremantle, 3rd Baron Cottesloe (1862–1956), expert rifleman and Olympian
See also William Thomas Freemantle (1849–1931), British author and organist