Stephen Andrew Bustin (born 1954) is a British scientist, former professor of molecular sciences at Queen Mary University of London from 2004 to 2012, as well as visiting professor at Middlesex University, beginning in 2006. In 2012 he was appointed Professor of Allied Health and Medicine at Anglia Ruskin University. He is known for his research into polymerase chain reaction, and has written a book on the topic, entitled A-Z of Quantitative PCR. This book has been called "the bible of qPCR."