The Internal Security Department (Malay: Jabatan Keselamatan Dalam Negeri, or JKDN or KDN) is Brunei's domestic intelligence agency, which is under the Prime Minister's Office.

[3] The ISD was created to replace the Royal Brunei Police's Special Branch division, which was disbanded on 1 August 1993.

[4] In 2011, Tobishima Corporation was the contractor responsible for completing the Latifudin Complex Tungku Link in Rimba.

[5] The ISD is in charge of cases that involve subversion, espionage, sabotage, terrorism and promotion of racial/religious violence.

[7] The ISD has its headquarters at Jalan Utama Mentiri with branch offices in Tutong, Belait and Temburong.