Wiley, Harvey Washington (1844-1930), a United States chemist. His campaign against adulterated food resulted in the Pure Food and Drugs Act of 1906. He administered the act as chief chemist of the Department of Agriculture, 1883-1912, and had to overcome determined opposition to the rigid standards he set. Wiley also did pioneering work in chemical analysis of agricultural products and devised new methods of processing sugar crops. He did much of his research while professor of agricultural chemistry at George Washington University, 1899-1914.

Wiley was born in Kent, Indiana. He took an M.D. degree at Indiana Medical College and studied chemistry at Harvard University. Wiley wrote scientific papers, government bulletins, magazine articles, and books as part of his campaign against poisoned food.