Peter David Rathjen (born 12 February 1964 in Cambridge, England) is an Australian scientist and medical researcher internationally recognised in stem cell science.
He is the 22nd Vice-Chancellor of the University of Adelaide, as of January 2018.
During his period at the University of Tasmania, he led a range of projects to position the University as a driver of socio-economic prosperity in Tasmania, including the creation of University precincts and facilities within the CBDs of Hobart, Launceston and Burnie.
His research specialty is embryonic development and particularly the development of stem cell therapies for replacement heart muscle, blood and nerve cells.