Lara Grangeon (born 21 September 1991) is a French swimmer from the territory of New Caledonia who competes in the individual medley and butterfly events.

At the 2012 Summer Olympics she finished 18th overall in the heats in the 400 metre individual medley and failed to reach the final.

At the 2007 and 2011 Games, Grangeon swam on several relay teams together with Diane Bui Duyet, who also represents both France and New Caledonia.

At the 2015 European Short Course Championships in Netanya, Israel, Grangeon broke the French record in the 400 meter individual medley with a time of 4:29.14.

[7] She has qualified to represent France at the 2020 Summer Olympics, and competed the 10 km open water marathon.