Please note that the content of this book mainly consists of articles that are available online from Wikipedia or other free sources. Adolf (Ferdinand Helmut August Wilhelm) Langfeld (August 27, 1854 in Rostock; August 4, 1939 in Schwerin) was a German jurist and politician who served as the State Minister of the Grand Duchy of Mecklenburg-Schwerin from 1914 to 1918. Langfeld studied law and initially worked as a lawyer; later, he held various positions in the judiciary of the Grand Duchy of Mecklenburg-Schwerin. He accompanied Hereditary Grand Duke Friedrich Franz, who later became Grand Duke Friedrich Franz IV, as a tutor during his law studies in Bonn. In 1914, he was appointed State Minister of the Grand Duchy by the now Grand Duke Friedrich Franz IV. He held this position until the outbreak of the November Revolution in 1918. He then retired.