Xenophon Paionidis (Greek: Ξενοφών Παιονίδης; 1863-1933) was a Greek architect from Chalkidiki (Fourka), notable for his works in the city of Thessaloniki. Among his works are the former Italian consulate (1878), Papafeio Orphanage (1894), Ioannidis civil school (1900), Nedelkos mansion (1909), "Villa Mordoch" (1905), the old Post Office (1921) and others.
In Chalkidiki, he designed the Polygyros high school, such as the schools of Ormylia, Nikiti, Vasilika, Vrastama, Sykia and Parthenonas villages.