The Biblioteca William Mulloy (Spanish for William Mulloy Library; in Rapa Nui, Hare Puka ko Wiliam Mulloy) is a research library administered by the Father Sebastian Englert Anthropological Museum on Rapa Nui (Easter Island) in Chilean Polynesia. Named for the late Dr. William Mulloy, an American archaeologist, the library’s collection focuses on Rapa Nui and Polynesian Studies, especially the prehistory, history, ethnology, archaeology, cultural anthropology, osteology and geology of Easter Island.