Thietmar II, Dietmar II or Ditmar II may refer to:
Thietmar, Margrave of Meissen (died 979), sometimes numbered Thietmar II Thietmar, Margrave of the Saxon Ostmark (died 1030), sometimes numbered Thietmar II Dietmar II (archbishop of Salzburg) () Dietmar II, abbot of Metten Abbey () Thietmar II, abbot of Helmarshausen Abbey () Dietmar II von Plötzkau, bishop of Verden () () Dietmar II von Stockhausen, abbot of Corvey () Dietmar II, abbot of Saint Peter's Abbey, Salzburg () Dietmar II, abbot of Seitenstetten Abbey ()