Candice Sue Millard is an American writer and journalist. She is a former writer and editor for National Geographic and the author of four acclaimed 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.
• River of the Gods: About the search for the source of the Nile River.

Her first book, The River of Doubt: Theodore Roosevelt's Darkest Journey, was a New York Times bestseller and was named one of the best books of the year by the New York Times, Washington Post, San Francisco Chronicle, Christian Science Monitor, and Kansas City Star. The book was also a Barnes & Noble Discover Great New Writers selection and a Book Sense Pick, was a finalist for the Quill Awards, and won the William Rockhill Nelson Award. It has been published in Portuguese, Mandarin, and Korean, as well as a British edition.