Harriet Chalmers Adams (October 22, 1875 – July 17, 1937) was an American explorer, writer and photographer. She traveled extensively in South America, Asia and the South Pacific in the early 20th century, and published accounts of her journeys in the National Geographic magazine. She lectured frequently on her travels and illustrated her talks with color slides and movies.
Harriet Chalmers Adams was born in to Alexander Chalmers and Frances Wilkens. On October 5, 1899 she married Franklin Pierce Adams. In 1904, Adams went on her first major expedition, a three-year trip around South America with her husband, during which they visited every country, and traversed the Andes on horseback. The New York Times wrote that she "reached twenty frontiers previously unknown to white women."
In a later trip she retraced the trail of Christopher Columbus's early discoveries in the Americas, and crossed Haiti on horseback.
Adams served as a correspondent for Harper's Magazine in Europe during World War I. She was the only female journalist permitted to visit the trenches. Later she and her husband visited eastern Bolivia during a second extended trip to South America.
From 1907 to 1935, she wrote twenty-one articles for the National Geographic Society that featured her photographs, including "Some Wonderful Sights in the Andean Highlands" (September 1908), "Kaleidoscopic La Paz: City of the Clouds" (February 1909) and "River-Encircled Paraguay" (April 1933). She wrote on Trinidad, Surinam, Bolivia, Peru and the trans-Andean railroad between Buenos Aires and Valparaiso.
In 1925, Adams helped launch the Society of Woman Geographers. In all, Adams is said to have travelled more than a hundred thousand miles, and captivated hundreds of audiences. The New York Times wrote "Harriet Chalmers Adams is America's greatest woman explorer. As a lecturer no one, man or woman, has a more magnetic hold over an audience than she."