Conrad Louis Wirth (December 1, 1899 – July 25, 1993) was an American landscape architect, conservationist, and park service administrator. He served as the director of the National Park Service (NPS) between 1951 and 1964. He went on to supervise the Interior Department's CCC program. A member of the National Geographic Society's Board of Trustees, he was also active in conservation and Park Service alumni affairs. He died in his sleep in 1993.