Ngô Đình Cẩn (Vietnamese: [ŋo˧ ɗɨ̞̠n˦˩ kəŋ˦˩]; 1911 – 9 May 1964) was a younger brother and confidant of South Vietnam's first president, Ngô Đình Diệm, and an important member of the Diệm government. Diệm put Cẩn in charge of central Vietnam, stretching from Phan Thiết in the south to the border at the 17th parallel, with Cẩn ruling the region as a virtual dictator. Based in the former imperial capital of Huế, Cẩn operated private armies and secret police that controlled the central region and earned himself a reputation as the most oppressive of the Ngô brothers.