Joseph Fernand Lionel Vianney Décarie, OC GOQ, was a Canadian philosopher.

His grandfather, Barthélémy Thélesphore Décarie, was a major landowner, whose farms stretched through the west end of present-day Montreal and the village of Notre Dame de Grace.

At 17, he won the Prix Colin de Rhétorique for the best marks in the province among the collèges classiques, the religious-run preparatory schools in Quebec.

His work called for a more robust post-secondary system: a research council, better peer review and a body to implement best practices for university administrators; all of which preceded the Parent Commission.

He published L'object de la métaphysique selon Aristotle, one of the most important books on the philosopher.

[citation needed] He obtained the Doctorat d'État from La Sorbonne and was featured in the pages of Paris Match.