Kellinghusen is an Amt ("collective municipality") in the district of Steinburg, in Schleswig-Holstein, Germany. Its seat is in Kellinghusen and in the Amt is situated the lesser-populated settlement of the nation, Wiedenborstel.HistoryBefore 1 January 2008, when it was joined by the town Kellinghusen and the municipalities Hohenlockstedt and Lockstedt from the former Amt Hohenlockstedt, it was named Kellinghusen-Land.SubdivisionThe Amt Kellinghusen consists of the following municipalities :Brokstedt Fitzbek Hennstedt Hingstheide Hohenlockstedt Kellinghusen Lockstedt Mühlenbarbek Oeschebüttel Poyenberg Quarnstedt Rade Rosdorf Sarlhusen Störkathen Wiedenborstel Willenscharen Wrist Wulfsmoor