Katibah Nusantara or KN (Jawi: كتيبه نوسنتارا, transl. Katibah Archipelago), also known as Katibah Nusantara Lid Daulah Islamiyyah, Malay archipelago unit for the Islamic State in Iraq and Syria and Majmu'ah al Arkhabiliy, is a Southeast Asian Jihadist Militant organization part of the Islamic State of Iraq and the Levant (ISIS), composed of Malay-speaking individuals, mostly from Indonesia and Malaysia, but also from the Philippines and Singapore. They received international attention for being the perpetrators of the 2016 Jakarta attacks. It is made up of about 30 small cells.

Listed as terror organisation by Malaysia.^[1]

Katibah Nusantara was formally launched on 26 September 2014, headquartered in Al-Shaddadi, in the Syrian province of Hasakah. Its training ground is located in Poso, IndonesiaIn early April 2015, the unit achieved its first major combat success by capturing five Kurdish-held territories in Syria, speculating that the unit's main area of operations was still in Syria, before the 2016 Jakarta attacks.

The unit's first known Amir, or leader, is Abu Ibrahim al-Indunisiy. As of 2016, it is unknown whether he is still leader, but it is alleged that either Bahrun Naim, mastermind of the 2016 Jakarta attacks, or Bahrum Syah took over leadership.^{[2][3][4][5][6][7]}