Leo Groarke (born 1953) is a Canadian philosopher, known for his contributions to argumentation theory and informal logic.
Groarke has authored and edited a number of books, articles, and anthologies. Groarke has held numerous administrative positions at various Canadian universities, and served as the President of Trent University from 2014 to 2024.
He is the brother of philosophers Louis Groarke and Paul Groarke. The three are identical triplets.
Groarke's publications have concerned Ancient Greek philosophy, the history of ideas, and argumentation theory. He has published several papers on the possibility of arguments in non-linguistic modes, such as visual and musical arguments. With David Birdsell, he edited a special edition of Argumentation and Advocacy on Visual Argumentation in 2007. He is the author of the Stanford Encyclopedia of Philosophy entry for Informal Logic, and also wrote the 2008 edition of the Stanford Encyclopedia entry for Ancient Skepticism.
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