Keith Mansfield (born 1965) is an English writer and publisher. He is the author of the Johnny Mackintosh series of novels, has scripted and advised on several television programmes, including It's Not Rocket Science for the UK network ITV. He was formerly a book editor at Pergamon Press (when it was controlled by Robert Maxwell) where he was responsible for science encyclopedias mainly intended for post-graduates and then worked at Oxford University Press (OUP). After a period working on computer science books for Addison-Wesley (now part of Pearson), he returned to OUP as a commissioning editor of science books.