Stephen Moorbath (1929-) is a geochemist and pioneer of geological dating using isotopic techniques that have contributed to the quantitative evaluation of the processes that have shaped the Earth throughout its history. His initial research concentrated on the UK but in the early 1970s, along with colleagues from the Geological Survey of Greenland, he reported the dating of West Greenlandgneisses at 3.8 billion years old. Moorbath, who was born in Germany and emigrated to the UK with his father in 1939, obtained a scholarship to study at the University of Oxford after working as an Assistant Experimental Officer at the Atomic Energy Research Establishment at Harwell. His academic career was spent at the University of Oxford where he headed the Geological Age and Isotope Research Group for forty years.
- Birth name: Stephen Moorbath
- Born: 1929 Magdeburg, Germany
- Occupation: Geologist
- Disciplines: Geology
- Education: Lincoln College, University of Oxford