Cornelia Elizabeth Bryce Pinchot (August 20, 1881 – September 9, 1960), also known as “Leila Pinchot,” was a 20th-century American conservationist, Progressive politician, and women’s rights activist who played a key role in the improvement of Grey Towers, the Pinchot family estate in Milford, Pennsylvania, which was donated to the U.S. Forest Service in 1963 and then designated as a National Historic Landmark in 1966. A maternal great-granddaughter of Peter Cooper, founder of Cooper Union, and daughter of U.S. Congressman and Envoy Lloyd Stephens Bryce (1851–1917), she was the wife of Gifford Pinchot (1865-1946), the renowned conservationist and two-time Governor of the Commonwealth of Pennsylvania, and was also a close friend of U.S. President Theodore Roosevelt.