HM The Queen appointed Roger Cashmore Companion of the Most Distinguished Order of St Michael and St George for services to international co-operation in particle physics in the New Year Honours List 2004. He was awarded the C.V. Boys Prize in 1983. He was elected a Fellow of the Institute of Physics in 1985, a member of Academia Europa in 1992, a Fellow of the Royal Society of Arts in 1996, and a Fellow of the Royal Society in 1998. He is a member of the Advisory Council for the Campaign for Science and Engineering.