text: Iron isotopes have many applications in the geosciences, biology, medicine, and other fields. Their ability to act as isotopic tracers allows for their use to determine information regarding the formation of geologic units and as a potential proxy for life on Earth and other planets. Iron isotopes also have applications in anthropology and paleontology, as they are used to study the diets of ancient civilizations and animals. The widespread uses of iron in biology make its isotopes a promising frontier in biomedical research, specifically their use to prevent and treat blood conditions and other pathological blood diseases. Some of the more prevalent applications of iron isotopes are described below.