Lieutenant-Colonel Martin Michael Charles Charteris, Baron Charteris of Amisfield, GCB, GCVO, OBE, QSO, PC (7 September 1913 – 23 December 1999) was a British Army officer and courtier of Queen Elizabeth II.

[3] Charteris was the longest-serving Assistant Private Secretary to the Sovereign, having served for over 18 years in that position.

His father, a barrister, was killed in action in Egypt in the First World War, and his mother remarried in 1922.

In 1950, he was appointed Private Secretary to Princess Elizabeth, who was then Duchess of Edinburgh and heir presumptive to the British throne.

[8] In the first two seasons of the Netflix series The Crown, Charteris was portrayed by Harry Hadden-Paton.