Stephen Grenville Fremantle (1810-18 April 1860) was a naval officer in the Royal Navy.
He was the youngest son of Vice-Admiral Sir Thomas Fremantle.
In 1829 was promoted to lieutenant then, in 1836, to commander on HMS Clio, Southampton and HMS Wanderer at the Cape of Good Hope and on the South America Station and in China respectively.
He served in North America, before being appointed to HMS Arrogant in 1852 on the Home Station.
[1] He is buried in St Swithun's Churchyard, Swanbourne, Buckinghamshire, where his family was established.