Captain George John Sandys (/ˈsændz/; 23 September 1875 - 3 September 1937) was a British diplomat and Conservative politician.

Sandys was the son of James Sandys, of Slade House, Stroud, Gloucestershire, and was educated at Clifton College and Pembroke College, Oxford.

He was commissioned as a Second Lieutenant in the 5th Dragoon Guards, and served in the South African War (1899–1901) with the Glamorgan Yeomanry, receiving a promotion to Lieutenant 28 August 1901. After the war he transferred to the 2nd Life Guards, leaving the army in 1905, but rejoined to serve in the British Expeditionary Force in the First World War, during which he was wounded.

Sandys was a Member of Parliament for Wells from 1910 to 1918. He later joined the diplomatic service, serving as an Honorary Attaché in the British Legation in Berne (1921-22) and Paris (1922-25). He died in Antibes, France.

His son Duncan Sandys became a member of parliament and cabinet minister, and his granddaughter Laura Sandys, also a Conservative politician, was elected to represent South Thanet in 2010.