| Agency Name: | Internal Security Department |
| Nativename: | Malay: Jabatan Keselamatan Dalam Negeri جابتن كسلامتن دالم نڬري |
| Preceding1: | Royal Brunei Police Force Special Branch |
| Jurisdiction: | Government of Brunei |
| Headquarters: | Jalan Utama Mentiri, Kampong Sungai Tilong, Mukim Berakas 'B', Brunei BC3315 |
| Parent Agency: | Prime Minister's Office |
| Website: | Official website |
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.[1] They are known to detain anyone suspected of being a threat to Brunei's national security for as long as needed.[2]
They are involved in both criminal and intelligence matters.[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.[6] However, the ISD collaborates with the Royal Brunei Police Force to maintain internal security.[7]
The ISD has its headquarters at Jalan Utama Mentiri with branch offices in Tutong, Belait and Temburong.[8]