Sir Herbert John Seddon CMG FRCS (13 July 1903 – 21 December 1977) was an English orthopaedic surgeon. He was Nuffield Professor of Orthopaedic Surgery at the University of Oxford, where his work and publications on peripheral nerve injuries gained him an international reputation. His classification of nerve injuries forms the basis of that in use into the 21st century. He went on to become director of the new Institute of Orthopaedics in London and subsequently the first Professor of Orthopaedics in the University of London. In this role he directed basic science research into orthopaedic conditions and developed postgraduate training in orthopaedic surgery. He was President of the British Orthopaedic Association, and was knighted in 1964 for services to orthopaedics.