Anthony I or Antony I may refer to:
Anthony I of Constantinople, Archbishop of Constantinople and Ecumenical Patriarch from 821 to 837 Anthony I, Count of Ligny (1450–1519) Anthony I, Lord of Monaco (died 1358) Antonio I, Prince of Monaco (1661–1731) Anthony I, Serbian Patriarch, Archbishop of Peć and Serbian Patriarch from 1571 to 1574 Anthony I of Portugal (1531–1595), King of Portugal in 1580 Anthony I, Eritrean Patriarch (1929–2022), Archbishop of Asmara and Eritrean Patriarch from 2004 to 2007 Anthony I, Count of Oldenburg (1505–1573) See also Patriarch Anthony (disambiguation)