Lesley Ann Stewart (born 27 May 1963) is a Scottish academic whose research interests are in the development and application of evidence synthesis methods, particularly systematic reviews and individual participant data meta-analysis.
She was one of the founders of the Cochrane Collaboration in 1993.
Stewart served as President of the Society for Research Synthesis Methodology (2013-2016) and is the Co-editor in chief of the academic journal Systematic Reviews.