Harry Raymond Eastlack, Jr. (17 November 1933 – 11 November 1973) was the subject of the most recognized case of FOP (fibrodysplasia ossificans progressiva) from the 20th Century. His case is also particularly acknowledged, by scientists and researchers, for his contribution to medical advancement. After suffering from a rare, disabling, and currently incurable genetic disease, Eastlack decided to have his skeleton and medical history donated to the Mütter Museum of the College of Physicians of Philadelphia in support of FOP research. His skeleton is one of the few FOP-presenting, fully articulated ones in existence, and it has proved valuable to the study of the disease.