Sir Peter James Donnelly FRS FMedSci (born 15 May 1959) is an Australian-British mathematician and Professor of Statistical Science at the University of Oxford, and the CEO of Genomics PLC.

His research group at Oxford has an international reputation for the development of statistical methodology to analyze genetic data.

From 2007 to 2018, he was Director, Wellcome Trust Centre for Human Genetics (WTCHG) in Oxford.

Many leading statistical geneticists worked with Donnelly as young researchers including David Balding, Matthew Stephens and Jonathan Pritchard.

[7] In 2015, Donnelly was elected as Chairman of the Royal Society's Machine Learning Working Group.