Marilyn Fogel (September 19, 1952 – May 11, 2022) was an American geo-ecologist and Professor of Geo-ecology at UC Riverside in Riverside, California. She is known for her work with stable isotope geochemistry, studying ancient climate, animal behavior, ecology, and astrobiology. Fogel has also served in many leadership roles, including Program Director at the National Science Foundation in geobiology and low-temperature geochemistry.