Duchesneau (unknown – 5 January 1791) was a member of the Parisian Rite of the Templar Order and an associate of Charles Gabriel Sivert. He was part of a group of Templars that aimed to gain recognition from the new Grand Master, François-Thomas Germain, by procuring funds from the nobility and the clergy.
In January 1791, Duchesneau was set to meet with Sivert at theNotre-Dame to report on his progress. Due to the recent death of their accomplice, Arpinon, he had local guards paid off to ensure they would not be disturbed.
Before entering the cathedral, Duchesneau met with a local priest and convinced him to give the Templars a cut of the clergy's finances. Shortly thereafter, the Templar was killed by the Assassin Arno Dorian, who pursued Sivert as part of his quest to bring the murders of his stepfather, François de la Serre, to justice.