William Fremantle
William Fremantle may refer to:

William Fremantle (politician) (1766–1850), British courtier and politician
William Fremantle (Dean of Ripon, died 1895) (1807–1895), Anglican priest and Dean of Ripon
William Fremantle (Dean of Ripon, died 1916) (1831–1916), Anglican priest and Dean of Ripon

See also
 William Thomas Freemantle (1849–1931), British author and organist