Augustus Charles Lennox FitzRoy, 7th Duke of Grafton (22 June 1821 – 4 December 1918), styled Lord Augustus FitzRoy before 1882, was a British Army officer. He was the second son of Henry FitzRoy, 5th Duke of Grafton, and his wife Mary Caroline Cranfield Berkeley, daughter of Admiral the Hon. Sir George Cranfield Berkeley. He joined the army in 1837 and was wounded in the Crimean War. On 9 June 1847, he married Anna Balfour (15 June 1825 – 23 December 1857), daughter of James Balfour MP. Together, they had four children: He died in 1918, aged 97, at Wakefield Lodge near Potterspury, Northamptonshire.