Rantzau may refer to:
Places Rantzau (Amt), an Amt in the district of Pinneberg, Schleswig-Holstein, Germany Rantzau, Plön, a municipality in the district of Plön, Schleswig-Holstein, Germany Rantzau (county), a former state in the Holy Roman Empire
People Johan Rantzau (1492–1565), German-Danish general and statesman Balthasar Rantzau (c. 1497–1547), Prince-Bishop of Lübeck, Germany Heinrich Rantzau (1526–1598), German-Danish humanist writer and statesman Daniel Rantzau (1529–1569), Danish-German general Breide Rantzau (died 1618), German nobleman in Danish service Gert Rantzau (1558–1627) German nobleman in Danish service Christian zu Rantzau (1614–1663), governor of the Duchy of Holstein Jørgen Rantzau (1652–1713), Danish military officer Josias von Rantzau (1609–1650), Danish military officer and Marshal of France Christian Rantzau (1684–1771), Danish nobleman, civil servant and Governor-general of Norway Schack Carl Rantzau (1717–1789), Danish-German general Ulrich von Brockdorff-Rantzau (1869–1928), German diplomat Heino von Rantzau (1894–1946), German Luftwaffe General
Other Rantzau (family), a noble family of Schleswig-Holstein, Germany Rantzau (horse) (1946–1971), a racehorse Rantzau (river), a river in Schleswig-Holstein, Germany I Rantzau, an 1892 opera by Pietro Mascagni