Howard Andrew Knox (March 7, 1885 – July 27, 1949) was an American medical doctor specializing in heart and rheumatic diseases. Serving as an assistant surgeon at Ellis Island during the early 1900s, he made major contributions to intelligence testing through the methods he devised to screen immigrants for mental deficiencies. However, at the time of his death, he was most well known as a veteran, a general physician, and a contributing member of his community, and his contributions to intelligence testing had become largely forgotten. Although his work in this area has become largely overlooked, his contributions have served as an important link between early intelligence research and present day intelligence testing.