Brigadier-General Wilfrith Gerald Key Green CB CMG DSO (3 November 1872 – 29 May 1937) was a Welsh officer in the British Army and later a brigadier-general in the British Indian Army. In the First World War he served on the Western Front and in the Sinai and Palestine campaign, where he commanded the 10th Cavalry Brigade. He also commanded the 1st Indian Cavalry Brigade in India after the war.