John P. Smol, OC FRS FRSC is a Canadian ecologist, limnologist and paleolimnologist who is a Distinguished University Professor in the Department of Biology at Queen's University, Kingston, Ontario, where he also held the Canada Research Chair in Environmental Change for the maximum of three 7-year terms (2001 – 2021). He founded and co-directs the Paleoecological Environmental Assessment and Research Lab (PEARL).