Lieutenant Frederick John Cokayne Frith (22 September 1858 – 5 June 1879) was a Scottish officer in the British Army. He served as adjutant to Colonel Drury Drury-Lowe of the 17th Lancers cavalry regiment during the Anglo-Zulu War. He was killed by a Zulu sniper during the Zungeni Mountain skirmish, leading to the British withdrawing from the engagement.