Pierre Lemonnier (born 6 July 1993) is a French footballer who plays as a defender for Guingamp of Ligue 2. He previously appeared in the Coupe de la Ligue for Ligue 2 club Dijon, played in the fourth and fifth tiers for Rennes B, Dijon B and Granville, with whom he reached the quarter-finals of the 2015–16 Coupe de France, and helped Le Mans gain promotion to the Championnat National in 2017–18 and to Ligue 2 the following season.