Frederick Miller Endlich (June 14, 1851 - July 17, 1899) was a mineralogist, chemist, and mining engineer. Born in Germany, he received a doctorate from the Universität Tübingen and emigrated to the United States of America. From 1872 to 1880, he worked at the Smithsonian Institution and participated in the U.S. Geological and Geographical Survey of the Territories. Afterwards, he served as a mining engineer consultant throughout the American West.