Bryan G. Alton (5 June 1919 – 18 January 1991) was an Irish physician and member of Seanad Éireann from 1965 to 1973.
He was the personal doctor of Éamon de Valera. His uncle was Ernest Alton, who was also a Senator.
He was elected to the 11th Seanad in 1965 for the National University of Ireland constituency. He was re-elected to the Seanad in 1969. He did not contest the 1973 Seanad election.