Ernest Cotton Deane MC (4 May 1887 – 25 September 1915) was a medical officer of the British Indian Army and an Irish international rugby player. Born in the city of Limerick, Ireland, he went to school in Kingstown (present day Dún Laoghaire) in County Dublin and then studied medicine at the Royal College of Surgeons in Ireland (RCSI), graduating in 1909. He was selected to play rugby for Ireland in one match, against England in February 1909. His rugby career was cut short when he broke his leg in a match against Oxford University.