Pierre-Euclide Roy (November 2, 1826 - October 1, 1882) was a Quebec businessman and politician.
He was born at Saint-Roch-de-l'Achigan, close to L'Assomption.
He was the son of Pierre-Octave Roy, a merchant, and Josephte Beaudry.
Roy became a merchant at Saint-Pie, near Saint-Hyacinthe.