The Bad Nenndorf interrogation centre was a British Combined Services Detailed Interrogation Centre (CSDIC) located within the Winckler-Bath () complex and adjacent buildings, in the West German town of Bad Nenndorf, district of Schaumburg, Lower Saxony. The interrogation centre operated from June 1945 to July 1947. Allegations of mistreatment of detainees by British troops resulted in a police investigation, a public controversy in both Britain and Germany, and the eventual closure of the interrogation centre. Four of the centre's officers were brought before courts martial in 1948; one of the four was convicted on charges of neglect, and Dismissed from Service.