Candice Sue Millard (born 1967) is an American writer and journalist. She is a former writer and editor for National Geographic and the author of four books: The River of Doubt, a history of the Roosevelt–Rondon Scientific Expedition of the Amazon rainforest in 1913–14; Destiny of the Republic, about the assassination of James A. Garfield; Hero of the Empire, about Winston Churchill's activities during the Boer War; and River of the Gods, about the search for the source of the Nile River.