
Loukas Petridis (Greek: Λουκάς Πετρίδης) was an Ottoman Greek priest, monk and Metropolitan bishop of the Ecumenical Patriarchate of Constantinople.
Petridis was born in 1850 in Madytos, then Ottoman Empire (now Turkey). He became a monk in Karyes of Mount Athos and graduated from the Theological School of Halki in 1878. Then he served as a deacon of the Metropoly of Thessaloniki and later was appointed as a secretary of the ecclesiastical court. In 1886 he was elected Metropolitan of Serres. During his ecclesiastical career he also served as a Metropolitan bishop in Ainos since 1888, Dropull since 1899 and Veria in 1911.
Lastly, he served as a Metropolitan bishop in Philadelphia, where he died on 19 December 1912 at the age of 71 or 72.