Charles John Robert Hepburn-Stuart-Forbes-Trefusis, 21st Baron Clinton GCVO PC (18 January 1863 – 5 July 1957) was a British peer.

Educated at Oxford he played polo with the University team and won the Varsity Match against Cambridge in 1883.

[1] On 1 June 1886, he married Lady Jane McDonnell (15 June 1863 – 27 August 1953) (a daughter of the 5th Earl of Antrim and his second cousin once-removed) and they had two daughters: From 1898 until he succeeded to his father's title in 1904, Trefusis was Convener of Kincardineshire County Council.

From 1918 to 1919, he was Joint Parliamentary Secretary to the Board of Agriculture and Fisheries, Chairman of the Forestry Commission from 1927 to 1929, and a director of the Southern Railway.

[2] Lord Clinton had also been admitted to the Privy Council in 1927 and on his retirement in 1933, he was appointed a GCVO.