Roger Ainsworth (born 1951) is Master of St Catherine's College, Oxford and Professor of Engineering Science at the University of Oxford, England. Ainsworth was educated at Lancaster Royal Grammar School. After an apprenticeship at Rolls-Royce Aeroengines, he studied at Jesus College, Oxford and was awarded a First class BA in 1973, and became Doctor of Philosophy in 1976. Dr. Ainsworth then worked in industry, initially for Rolls-Royce and later for the Atomic Energy Research Establishment. He returned to Oxford in 1985 as a tutorial Fellow of St Catherine's College where he stayed until 2002.