Harold John Cook FRCP (born 1952) is John F. Nickoll Professor of History at Brown University and was director of the Wellcome Trust Centre for the History of Medicine at University College, London (UCL) from 2000 to 2009, and was the Queen Wilhelmina Visiting Professor of History at Columbia University in New York during the 2007–2008 academic year. Cook is co-editor of the journal Medical History, serves on a number of advisory boards and professional bodies, and has been elected to an honorary Fellowship of the Royal College of Physicians.