Vice Admiral Sir Clive Charles Carruthers Johnstone, KBE, CB (6 September 1963 – 12 May 2024) was a British Royal Navy officer who served as Commander, Allied Maritime Command from 2015 to 2019.

He studied anthropology at Durham University, graduating with a Bachelor of Arts (BA) degree.

His tenure during her final commission covered a visit by then-Prince Charles to Northern Ireland, Prince Charles's participation in the 1997 Hong Kong handover ceremony, and a summer cruise by Queen Elizabeth II to the Western Isles.

[4] He became the Fleet Programmer in 2001, commanding officer of the amphibious transport dock HMS Bulwark in 2005,[5] and Director of Naval Staff at the Ministry of Defence in April 2008.

[10] Johnstone was appointed a Knight Commander of the Order of the British Empire in the 2019 New Year Honours,[11] and retired from the Royal Navy on 3 January 2020.