William Henry Phelps Sr. was an American ornithologist and businessman. One of his sons, William H. Phelps Jr., was also an ornithologist, and collaborated with him. William Phelps was the founder of the William Phelps Ornithological Collection, located in Sabana Grande. This is still the most important private ornithological collection of the world.

The William Phelps Ornithological Collection, also known as the Phelps Ornithological Museum, is a museum of natural sciences dedicated to the study, exhibition and preservation of the birds of Venezuela and the rest of Latin America. The collection is located east of Caracas and in the geographic center of Greater Caracas, in the heart of the Sabana Grande district. The William Phelps ornithological collection is the most important in Latin America and it is also the most important private collection in the world in its research area.