Adolf I may refer to:
Adolf I of Lotharingia (died 1018), Vogt of Deutz Adolf I of Berg (died 1086) Adolf I of Holstein (died 1130), Count of Schauenburg Adolf I, Archbishop of Cologne or Adolf of Altena or Adolf of Berg (c. 1157–1220) Adolf I, Count of the Mark (1194–1249) Adolf I, Prince of Schaumburg-Lippe (1817–1893) Adolf I of Luxembourg (1817–1905) Adolf Frederick I, Duke of Mecklenburg (1588–1658)
See also Adolph I (disambiguation)