Charles Alfred Euston FitzRoy, 10th Duke of Grafton (4 June 1892 – 11 November 1970), known as Charles FitzRoy until 1936, was a British aristocrat, soldier, and farmer.
FitzRoy was born at Euston Hall near Thetford, the eldest son of the Reverend Lord Charles Edward FitzRoy and of his wife Ismay FitzRoy, daughter of Charles FitzRoy, 3rd Baron Southampton. His paternal grandparents were Augustus FitzRoy, 7th Duke of Grafton and Anna Balfour. Another ancestor, Anne Warren, was the daughter of Adml. Sir Peter Warren and a descendant of the Schuyler family, the Van Cortlandt family, and the Delancey family, all from British North America.
He was educated at Wellington and then at the Royal Military College, Sandhurst.
In 1911 FitzRoy joined the Royal Welch Fusiliers, who were stationed at Quetta in what is now Pakistan. In 1914, soon after the outbreak of the Great War, he went to France, and in 1917 he was appointed as aide-de-camp and comptroller to Lord Buxton, Governor General of South Africa. He remained in South Africa until 1920. In 1921 he retired from the army.
FitzRoy became a farmer at Coney Weston in Suffolk. From 1927 to 1936 he was land agent for his first wife's maternal uncle Owen Hugh Smith at Langham in Rutland. In 1936 he succeeded his cousin as Duke of Grafton and inherited the family estates based on Euston Hall.