Pierre-Euclide Roy (November 2, 1826 – October 1, 1882) was a Quebec businessman and politician.
He was the son of Pierre-Octave Roy, a merchant, and Josephte Beaudry.
He was also the treasurer of the Phillipsburg, Farnham and Yamaska Railway Company.
Roy was appointed to the Legislative Council of Quebec on November 19, 1873, representing the division of Saurel.
Roy died in office at Saint-Pie, on October 31 1882.