Colonel Caleb Grafton Roberts MC (31 January 1898 – 23 November 1965) was an Australian civil engineer and army officer. Born in New South Wales, he was the son of English-born Australian artist Tom Roberts. Roberts relocated to London with his family in 1903 and joined the British Army during the First World War. He served as an officer of the Royal Engineers in the Palestine campaign and on the Western Front. After the war he fought in the 1919 North Russia intervention where he received a Military Cross for gallantry. After the war Roberts studied civil engineering at East London College, University of London. After graduation he joined the Ministry of Transport. After his marriage to Norah Joan Watson in 1922 he worked as a resident engineer on the rebuilding of the A127 road.